prompt:
module top_module (
	input clk,
	input enable,
	input S,
	input A,
	input B,
	input C,
	output reg Z
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input enable,
	input S,
	input A,
	input B,
	input C,
	output reg Z
);

	reg [7:0] q;
	always @(posedge clk) begin
		if (enable)
			q <= {q[6:0], S};
	end

	assign Z = q[ {A, B, C} ];

endmodule

module stimulus_gen (
	input clk,
	output logic S, enable,
	output logic A, B, C,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		enable <= 0;
		{A,B,C} <= 0;
		S <= 1'bx;
		@(negedge clk) wavedrom_start("A 3-input AND gate");
			@(posedge clk);
			@(posedge clk) enable <= 1; S <= 1;
			@(posedge clk) S <= 0;
			@(posedge clk) S <= 0;
			@(posedge clk) S <= 0;
			@(posedge clk) S <= 0;
			@(posedge clk) S <= 0;
			@(posedge clk) S <= 0;
			@(posedge clk) S <= 0;
			@(posedge clk) enable <= 0; S <= 1'bx;
			{A,B,C} <= 5;
			@(posedge clk) {A,B,C} <= 6;
			@(posedge clk) {A,B,C} <= 7;
			@(posedge clk) {A,B,C} <= 0;
			@(posedge clk) {A,B,C} <= 1;
		@(negedge clk) wavedrom_stop();

		repeat(500) @(posedge clk, negedge clk) begin
			{A,B,C,S} <= $random;
			enable <= ($random&3) == 0;
		end

		$finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_Z;
		int errortime_Z;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic enable;
	logic S;
	logic A;
	logic B;
	logic C;
	logic Z_ref;
	logic Z_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,enable,S,A,B,C,Z_ref,Z_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.enable,
		.S,
		.A,
		.B,
		.C );
	reference_module good1 (
		.clk,
		.enable,
		.S,
		.A,
		.B,
		.C,
		.Z(Z_ref) );

	top_module top_module1 (
		.clk,
		.enable,
		.S,
		.A,
		.B,
		.C,
		.Z(Z_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_Z) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "Z", stats1.errors_Z, stats1.errortime_Z);
		else $display("Hint: Output '%s' has no mismatches.", "Z");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { Z_ref } === ( { Z_ref } ^ { Z_dut } ^ { Z_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (Z_ref !== ( Z_ref ^ Z_dut ^ Z_ref ))
		begin if (stats1.errors_Z == 0) stats1.errortime_Z = $time;
			stats1.errors_Z = stats1.errors_Z+1'b1; end

	end
endmodule

simple_description: This module takes in inputs of clk, enable, S, A, B, and C and outputs a register Z which is the value of q at the indices of A, B, and C.

detail_description: This Verilog module is a shift register with a multiplexer at the output. The module has an 8-bit register, q, and a 3-bit multiplexer. The clock, enable, and S inputs are used to control the register. When the enable signal is high, the register is enabled and the S input is shifted into the register. The A, B, and C inputs are used to select which bit of the register is output on the Z output. The A, B, and C inputs are combined to form a 3-bit address that is used to select which bit of the register is output on the Z output.


task_id: thermostat

prompt:
module top_module(
	input mode,
	input too_cold,
	input too_hot,
	input fan_on,
	output heater,
	output aircon,
	output fan
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input mode,
	input too_cold,
	input too_hot,
	input fan_on,
	output heater,
	output aircon,
	output fan
);

	assign fan = (mode ? too_cold : too_hot) | fan_on;
	assign heater = (mode & too_cold);
	assign aircon = (~mode & too_hot);

endmodule

module stimulus_gen (
	input clk,
	output reg too_cold, too_hot, mode, fan_on,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		{too_cold, too_hot, mode, fan_on} <= 4'b0010;
		@(negedge clk);
		wavedrom_start("Winter");
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0010;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0010;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b1010;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b1011;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0010;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0011;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0010;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0110;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b1110;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0111;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b1111;
		@(negedge clk) wavedrom_stop();

		{too_cold, too_hot, mode, fan_on} <= 4'b0000;
		@(negedge clk);
		wavedrom_start("Summer");
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0000;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0000;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0100;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0101;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0000;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0001;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b0000;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b1000;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b1100;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b1001;
			@(posedge clk) {too_cold, too_hot, mode, fan_on} <= 4'b1101;
		@(negedge clk) wavedrom_stop();

		repeat(200)
			@(posedge clk, negedge clk) {too_cold, too_hot, mode, fan_on} <= $random;

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_heater;
		int errortime_heater;
		int errors_aircon;
		int errortime_aircon;
		int errors_fan;
		int errortime_fan;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic mode;
	logic too_cold;
	logic too_hot;
	logic fan_on;
	logic heater_ref;
	logic heater_dut;
	logic aircon_ref;
	logic aircon_dut;
	logic fan_ref;
	logic fan_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,mode,too_cold,too_hot,fan_on,heater_ref,heater_dut,aircon_ref,aircon_dut,fan_ref,fan_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.mode,
		.too_cold,
		.too_hot,
		.fan_on );
	reference_module good1 (
		.mode,
		.too_cold,
		.too_hot,
		.fan_on,
		.heater(heater_ref),
		.aircon(aircon_ref),
		.fan(fan_ref) );

	top_module top_module1 (
		.mode,
		.too_cold,
		.too_hot,
		.fan_on,
		.heater(heater_dut),
		.aircon(aircon_dut),
		.fan(fan_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_heater) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "heater", stats1.errors_heater, stats1.errortime_heater);
		else $display("Hint: Output '%s' has no mismatches.", "heater");
		if (stats1.errors_aircon) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "aircon", stats1.errors_aircon, stats1.errortime_aircon);
		else $display("Hint: Output '%s' has no mismatches.", "aircon");
		if (stats1.errors_fan) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "fan", stats1.errors_fan, stats1.errortime_fan);
		else $display("Hint: Output '%s' has no mismatches.", "fan");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { heater_ref, aircon_ref, fan_ref } === ( { heater_ref, aircon_ref, fan_ref } ^ { heater_dut, aircon_dut, fan_dut } ^ { heater_ref, aircon_ref, fan_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (heater_ref !== ( heater_ref ^ heater_dut ^ heater_ref ))
		begin if (stats1.errors_heater == 0) stats1.errortime_heater = $time;
			stats1.errors_heater = stats1.errors_heater+1'b1; end
		if (aircon_ref !== ( aircon_ref ^ aircon_dut ^ aircon_ref ))
		begin if (stats1.errors_aircon == 0) stats1.errortime_aircon = $time;
			stats1.errors_aircon = stats1.errors_aircon+1'b1; end
		if (fan_ref !== ( fan_ref ^ fan_dut ^ fan_ref ))
		begin if (stats1.errors_fan == 0) stats1.errortime_fan = $time;
			stats1.errors_fan = stats1.errors_fan+1'b1; end

	end
endmodule

simple_description: The top module assigns the fan, heater, and aircon outputs based on the mode, too_cold, too_hot, and fan_on inputs.

detail_description: This Verilog module is used to control the temperature of a room. It has two inputs, mode and fan_on, and three outputs, heater, aircon and fan. The inputs mode and fan_on are used to determine the state of the system, while the outputs heater, aircon and fan are used to control the temperature of the room.  The mode input is used to determine the mode of operation. If mode is high, the system is in heating mode and if mode is low, the system is in cooling mode.  The fan_on input is used to control the fan. If fan_on is high, the fan will be turned on regardless of the mode.  The too_cold and too_hot inputs are used to determine the temperature of the room. If too_cold is high, the room is too cold and if too_hot is high, the room is too hot.  The fan output is used to control the fan. If fan is high, the fan will be turned on. The fan will be turned on if either too_cold or too_hot is high, or if fan_on is high.  The heater output is used to control the heater. If heater is high, the heater will be turned on. The heater will be turned on if mode is high and too_cold is high.  The aircon output is used to control the air conditioner. If aircon is high, the air conditioner will be turned on. The air conditioner will be turned on if mode is low and too_hot is high.


prompt:
module top_module (
	input a,
	input b,
	input c,
	input d,
	output out_sop,
	output out_pos
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input a,
	input b,
	input c,
	input d,
	output out_sop,
	output out_pos
);

	wire pos0, pos1;
	assign out_sop = c&d | ~a&~b&c;
	assign pos0 = c & (~b|d)&(~a|b);
	assign pos1 = c & (~b|d)&(~a|d);

	assign out_pos = (pos0 == pos1) ? pos0 : 1'bx;
endmodule

module stimulus_gen (
	input clk,
	output logic a, b, c, d,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable,
	input tb_match
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	bit fail = 0;
	bit fail1 = 0;
	always @(posedge clk, negedge clk)
		if (!tb_match)
			fail = 1;

	initial begin
		@(posedge clk) {a,b,c,d} <= 0;
		@(posedge clk) {a,b,c,d} <= 1;
		@(posedge clk) {a,b,c,d} <= 2;
		@(posedge clk) {a,b,c,d} <= 4;
		@(posedge clk) {a,b,c,d} <= 5;
		@(posedge clk) {a,b,c,d} <= 6;
		@(posedge clk) {a,b,c,d} <= 7;
		@(posedge clk) {a,b,c,d} <= 9;
		@(posedge clk) {a,b,c,d} <= 10;
		@(posedge clk) {a,b,c,d} <= 13;
		@(posedge clk) {a,b,c,d} <= 14;
		@(posedge clk) {a,b,c,d} <= 15;
		@(posedge clk) fail1 = fail;

		//@(negedge clk) wavedrom_start();
			for (int i=0;i<16;i++)
				@(posedge clk)
					{a,b,c,d} <= i;
		//@(negedge clk) wavedrom_stop();

		repeat(50) @(posedge clk, negedge clk)
			{a,b,c,d} <= $random;

		if (fail && ~fail1)
			$display("Hint: Your circuit passes on the 12 required input combinations, but doesn't match the don't-care cases. Are you using minimal SOP and POS?");

		$finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_sop;
		int errortime_out_sop;
		int errors_out_pos;
		int errortime_out_pos;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic a;
	logic b;
	logic c;
	logic d;
	logic out_sop_ref;
	logic out_sop_dut;
	logic out_pos_ref;
	logic out_pos_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,a,b,c,d,out_sop_ref,out_sop_dut,out_pos_ref,out_pos_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.a,
		.b,
		.c,
		.d );
	reference_module good1 (
		.a,
		.b,
		.c,
		.d,
		.out_sop(out_sop_ref),
		.out_pos(out_pos_ref) );

	top_module top_module1 (
		.a,
		.b,
		.c,
		.d,
		.out_sop(out_sop_dut),
		.out_pos(out_pos_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_sop) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_sop", stats1.errors_out_sop, stats1.errortime_out_sop);
		else $display("Hint: Output '%s' has no mismatches.", "out_sop");
		if (stats1.errors_out_pos) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_pos", stats1.errors_out_pos, stats1.errortime_out_pos);
		else $display("Hint: Output '%s' has no mismatches.", "out_pos");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_sop_ref, out_pos_ref } === ( { out_sop_ref, out_pos_ref } ^ { out_sop_dut, out_pos_dut } ^ { out_sop_ref, out_pos_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_sop_ref !== ( out_sop_ref ^ out_sop_dut ^ out_sop_ref ))
		begin if (stats1.errors_out_sop == 0) stats1.errortime_out_sop = $time;
			stats1.errors_out_sop = stats1.errors_out_sop+1'b1; end
		if (out_pos_ref !== ( out_pos_ref ^ out_pos_dut ^ out_pos_ref ))
		begin if (stats1.errors_out_pos == 0) stats1.errortime_out_pos = $time;
			stats1.errors_out_pos = stats1.errors_out_pos+1'b1; end

	end
endmodule

simple_description: This module implements a Sum-of-Products (SOP) and a Product-of-Sums (POS) logic function of the inputs a, b, c, and d, and outputs out_sop and out_pos.

detail_description: This top module is a combinational logic circuit that takes in four inputs (a, b, c, d) and produces two outputs (out_sop, out_pos). The out_sop output is a Sum-of-Products (SOP) expression of the inputs, and out_pos is a Product-of-Sums (POS) expression of the inputs.   The out_sop output is generated by taking the logical AND of input c and d, and then taking the logical OR of the result with the logical AND of the logical NOT of input a, the logical NOT of input b, and input c.   The out_pos output is generated by first taking the logical AND of inputs c, the logical OR of the logical NOT of input b and input d, and the logical OR of the logical NOT of input a and input b. This result is assigned to the wire pos0. Then, the same logical AND is done, but with the logical OR of the logical NOT of input a and input d. This result is assigned to the wire pos1. Finally, the out_pos output is assigned to the result of a ternary expression that checks if pos0 and pos1 are equal, and if so, assigns out_pos to pos0, otherwise assigns out_pos to 1'bx (unknown).


prompt:
module top_module(
	input clk,
	input reset,
	output reg [31:0] q);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input clk,
	input reset,
	output reg [31:0] q);

	logic [31:0] q_next;
	always@(q) begin
		q_next = q[31:1];
		q_next[31] = q[0];
		q_next[21] ^= q[0];
		q_next[1] ^= q[0];
		q_next[0] ^= q[0];
	end

	always @(posedge clk) begin
		if (reset)
			q <= 32'h1;
		else
			q <= q_next;
	end
endmodule

module stimulus_gen (
	input clk,
	output reg reset
);

	initial begin
		repeat(400) @(posedge clk, negedge clk) begin
			reset <= !($random & 31);
		end
		@(posedge clk) reset <= 1'b0;
		repeat(200000) @(posedge clk);
		reset <= 1'b1;
		repeat(5) @(posedge clk);
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_q;
		int errortime_q;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic reset;
	logic [31:0] q_ref;
	logic [31:0] q_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,reset,q_ref,q_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.reset );
	reference_module good1 (
		.clk,
		.reset,
		.q(q_ref) );

	top_module top_module1 (
		.clk,
		.reset,
		.q(q_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_q) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "q", stats1.errors_q, stats1.errortime_q);
		else $display("Hint: Output '%s' has no mismatches.", "q");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { q_ref } === ( { q_ref } ^ { q_dut } ^ { q_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (q_ref !== ( q_ref ^ q_dut ^ q_ref ))
		begin if (stats1.errors_q == 0) stats1.errortime_q = $time;
			stats1.errors_q = stats1.errors_q+1'b1; end

	end
endmodule

detail_description: This top Verilog module implements a 32-bit shift register. The module has 3 ports: clk, reset, and q. The clk port is an input port that is used to synchronize the register. The reset port is an input port that is used to reset the register to the initial value. The q port is an output port that is used to output the value of the register. The module has two registers, q and q_next. The q_next register stores the next value of the register. The q register is updated on the rising edge of the clk signal. If the reset port is high, the register is reset to the initial value, 32'h1. Otherwise, the q register is updated with the value stored in the q_next register. The q_next register is updated on every clock cycle, and stores the value of the q register shifted by 1 bit. If the value of the q register is shifted out of bit 0, it is sent back to bit 31. Bits 21 and 1 are XORed with the value of bit 0. Bit 0 is also XORed with the value of bit 0.


prompt:
module top_module (
	input a,
	input b,
	input c,
	input d,
	output q
);

canonical_solution:
	assign q = (a|b) & (c|d);

endmodule

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input a,
	input b,
	input c,
	input d,
	output q
);

	assign q = (a|b) & (c|d);

endmodule

module stimulus_gen (
	input clk,
	output logic a,b,c,d,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		{a,b,c,d} <= 0;
		@(negedge clk) wavedrom_start("Unknown circuit");
			@(posedge clk) {a,b,c,d} <= 0;
			repeat(18) @(posedge clk, negedge clk) {a,b,c,d} <= {a,b,c,d} + 1;
		wavedrom_stop();

		repeat(100) @(posedge clk, negedge clk)
			{a,b,c,d} <= $urandom;
		$finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_q;
		int errortime_q;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic a;
	logic b;
	logic c;
	logic d;
	logic q_ref;
	logic q_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,a,b,c,d,q_ref,q_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.a,
		.b,
		.c,
		.d );
	reference_module good1 (
		.a,
		.b,
		.c,
		.d,
		.q(q_ref) );

	top_module top_module1 (
		.a,
		.b,
		.c,
		.d,
		.q(q_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_q) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "q", stats1.errors_q, stats1.errortime_q);
		else $display("Hint: Output '%s' has no mismatches.", "q");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { q_ref } === ( { q_ref } ^ { q_dut } ^ { q_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (q_ref !== ( q_ref ^ q_dut ^ q_ref ))
		begin if (stats1.errors_q == 0) stats1.errortime_q = $time;
			stats1.errors_q = stats1.errors_q+1'b1; end

	end
endmodule

simple_description: The top module assigns the output q to the result of the logical OR of a and b and the logical OR of c and d.

detail_description: This top Verilog module implements a logic gate that takes four inputs (a, b, c, and d) and outputs a single bit (q). The logic gate is a bitwise OR of the inputs a and b, and a bitwise OR of the inputs c and d. The output q is a bitwise AND of the two ORs. This means that the output q will be 1 only if at least one of the inputs a and b is 1, and at least one of the inputs c and d is 1.


prompt:
module top_module(
	input p1a,
	input p1b,
	input p1c,
	input p1d,
	output p1y,
	input p2a,
	input p2b,
	input p2c,
	input p2d,
	output p2y
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input p1a,
	input p1b,
	input p1c,
	input p1d,
	output p1y,
	input p2a,
	input p2b,
	input p2c,
	input p2d,
	output p2y
);

	assign p1y = ~&( {p1a, p1b, p1c, p1d} );
	assign p2y = ~&( {p2a, p2b, p2c, p2d} );

endmodule

module stimulus_gen (
	input clk,
	output reg p1a, p1b, p1c, p1d,
	output reg p2a, p2b, p2c, p2d,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		int count; count = 0;
		{p1a,p1b,p1c,p1d} <= 4'h0;
		{p2a,p2b,p2c,p2d} <= 4'h0;
		wavedrom_start("Two NAND gates");
		repeat(20) @(posedge clk) begin
			{p1a,p1b,p1c,p1d} <= count;
			{p2a,p2b,p2c,p2d} <= count+1;
			count = count + 1;
		end
		wavedrom_stop();

		repeat(200) @(posedge clk,negedge clk) begin
			{p1a,p1b,p1c,p1d,p2a,p2b,p2c,p2d} <= $random;
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_p1y;
		int errortime_p1y;
		int errors_p2y;
		int errortime_p2y;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic p1a;
	logic p1b;
	logic p1c;
	logic p1d;
	logic p2a;
	logic p2b;
	logic p2c;
	logic p2d;
	logic p1y_ref;
	logic p1y_dut;
	logic p2y_ref;
	logic p2y_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,p1a,p1b,p1c,p1d,p2a,p2b,p2c,p2d,p1y_ref,p1y_dut,p2y_ref,p2y_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.p1a,
		.p1b,
		.p1c,
		.p1d,
		.p2a,
		.p2b,
		.p2c,
		.p2d );
	reference_module good1 (
		.p1a,
		.p1b,
		.p1c,
		.p1d,
		.p2a,
		.p2b,
		.p2c,
		.p2d,
		.p1y(p1y_ref),
		.p2y(p2y_ref) );

	top_module top_module1 (
		.p1a,
		.p1b,
		.p1c,
		.p1d,
		.p2a,
		.p2b,
		.p2c,
		.p2d,
		.p1y(p1y_dut),
		.p2y(p2y_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_p1y) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "p1y", stats1.errors_p1y, stats1.errortime_p1y);
		else $display("Hint: Output '%s' has no mismatches.", "p1y");
		if (stats1.errors_p2y) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "p2y", stats1.errors_p2y, stats1.errortime_p2y);
		else $display("Hint: Output '%s' has no mismatches.", "p2y");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { p1y_ref, p2y_ref } === ( { p1y_ref, p2y_ref } ^ { p1y_dut, p2y_dut } ^ { p1y_ref, p2y_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (p1y_ref !== ( p1y_ref ^ p1y_dut ^ p1y_ref ))
		begin if (stats1.errors_p1y == 0) stats1.errortime_p1y = $time;
			stats1.errors_p1y = stats1.errors_p1y+1'b1; end
		if (p2y_ref !== ( p2y_ref ^ p2y_dut ^ p2y_ref ))
		begin if (stats1.errors_p2y == 0) stats1.errortime_p2y = $time;
			stats1.errors_p2y = stats1.errors_p2y+1'b1; end

	end
endmodule

simple_description: This module implements a 4-input AND gate with two outputs, p1y and p2y.

detail_description: This module is a simple logic gate that implements a 4-input AND gate with an inverted output. It has two sets of four inputs, p1a, p1b, p1c, and p1d, and p2a, p2b, p2c, and p2d. It also has two outputs, p1y and p2y. The p1y output is the result of the AND operation on the four inputs p1a, p1b, p1c, and p1d. The p2y output is the result of the AND operation on the four inputs p2a, p2b, p2c, and p2d. The outputs are inverted, so the output will be 0 if all the inputs are 1, and 1 if any of the inputs are 0.


prompt:
module top_module (
	input [254:0] in,
	output reg [7:0] out
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [254:0] in,
	output reg [7:0] out
);

	always_comb  begin
		out = 0;
		for (int i=0;i<255;i++)
			out = out + in[i];
	end

endmodule

module stimulus_gen (
	input clk,
	output logic [254:0] in,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		in <= 255'h0;
		wavedrom_start("");
		@(posedge clk, negedge clk) in <= 255'h0;
		@(posedge clk, negedge clk) in <= 255'h0;
		@(posedge clk, negedge clk) in <= 255'h1;
		@(posedge clk, negedge clk) in <= 255'h1;
		@(posedge clk, negedge clk) in <= 255'h3;
		@(posedge clk, negedge clk) in <= 255'h3;
		@(posedge clk, negedge clk) in <= 255'h7;
		@(posedge clk, negedge clk) in <= 255'haaaa;
		@(posedge clk, negedge clk) in <= 255'hf00000;
		@(posedge clk, negedge clk) in <= 255'h0;
		wavedrom_stop();
		repeat (200) @(posedge clk, negedge clk) begin
			in <= {$random, $random, $random, $random, $random, $random, $random, $random};
		end
		@(posedge clk);
		in <= '0;
		@(posedge clk)
		in <= '1;
		@(posedge clk)
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out;
		int errortime_out;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [254:0] in;
	logic [7:0] out_ref;
	logic [7:0] out_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_ref,out_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out(out_ref) );

	top_module top_module1 (
		.in,
		.out(out_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out", stats1.errors_out, stats1.errortime_out);
		else $display("Hint: Output '%s' has no mismatches.", "out");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_ref } === ( { out_ref } ^ { out_dut } ^ { out_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_ref !== ( out_ref ^ out_dut ^ out_ref ))
		begin if (stats1.errors_out == 0) stats1.errortime_out = $time;
			stats1.errors_out = stats1.errors_out+1'b1; end

	end
endmodule

simple_description: This module takes in a 255-bit input and sums the bits to produce an 8-bit output.

detail_description: This top module is a combinatorial module that adds up all the bits of the input signal "in" and stores the result in the output signal "out". The input signal "in" is a 255-bit wide vector, and the output signal "out" is an 8-bit wide vector.   The module contains an always_comb block, which is a type of block that is used to describe combinatorial logic. Inside the always_comb block, the output signal "out" is initialized to 0. Then, a for loop is used to iterate through all the bits of the input signal "in". For each bit, the value of "out" is incremented by the value of the corresponding bit in the input signal. After the for loop is finished, the output signal "out" will contain the sum of all the bits in the input signal.


task_id: gatesv

prompt:
module top_module (
	input [3:0] in,
	output [2:0] out_both,
	output [3:1] out_any,
	output [3:0] out_different
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [3:0] in,
	output [2:0] out_both,
	output [3:1] out_any,
	output [3:0] out_different
);

	assign out_both = in[2:0] & in[3:1];
	assign out_any = in[2:0] | in[3:1];
	assign out_different = in^{in[0], in[3:1]};

endmodule

module stimulus_gen (
	input clk,
	input tb_match,
	output logic [3:0] in,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		in <= 4'h3;
		@(negedge clk);
		wavedrom_start();
			@(posedge clk) in <= 3;
			@(posedge clk) in <= 6;
			@(posedge clk) in <= 12;
			@(posedge clk) in <= 9;
			@(posedge clk) in <= 5;
		@(negedge clk);
		wavedrom_stop();
		in <= $random;
		repeat(100) begin
			@(negedge clk) in <= $random;
			@(posedge clk) in <= $random;
		end
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_both;
		int errortime_out_both;
		int errors_out_any;
		int errortime_out_any;
		int errors_out_different;
		int errortime_out_different;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [3:0] in;
	logic [2:0] out_both_ref;
	logic [2:0] out_both_dut;
	logic [3:1] out_any_ref;
	logic [3:1] out_any_dut;
	logic [3:0] out_different_ref;
	logic [3:0] out_different_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_both_ref,out_both_dut,out_any_ref,out_any_dut,out_different_ref,out_different_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out_both(out_both_ref),
		.out_any(out_any_ref),
		.out_different(out_different_ref) );

	top_module top_module1 (
		.in,
		.out_both(out_both_dut),
		.out_any(out_any_dut),
		.out_different(out_different_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_both) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_both", stats1.errors_out_both, stats1.errortime_out_both);
		else $display("Hint: Output '%s' has no mismatches.", "out_both");
		if (stats1.errors_out_any) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_any", stats1.errors_out_any, stats1.errortime_out_any);
		else $display("Hint: Output '%s' has no mismatches.", "out_any");
		if (stats1.errors_out_different) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_different", stats1.errors_out_different, stats1.errortime_out_different);
		else $display("Hint: Output '%s' has no mismatches.", "out_different");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_both_ref, out_any_ref, out_different_ref } === ( { out_both_ref, out_any_ref, out_different_ref } ^ { out_both_dut, out_any_dut, out_different_dut } ^ { out_both_ref, out_any_ref, out_different_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_both_ref !== ( out_both_ref ^ out_both_dut ^ out_both_ref ))
		begin if (stats1.errors_out_both == 0) stats1.errortime_out_both = $time;
			stats1.errors_out_both = stats1.errors_out_both+1'b1; end
		if (out_any_ref !== ( out_any_ref ^ out_any_dut ^ out_any_ref ))
		begin if (stats1.errors_out_any == 0) stats1.errortime_out_any = $time;
			stats1.errors_out_any = stats1.errors_out_any+1'b1; end
		if (out_different_ref !== ( out_different_ref ^ out_different_dut ^ out_different_ref ))
		begin if (stats1.errors_out_different == 0) stats1.errortime_out_different = $time;
			stats1.errors_out_different = stats1.errors_out_different+1'b1; end

	end
endmodule

detail_description: This Verilog module is a top-level module that is used to evaluate a variety of bitwise functions. The module has six ports, an input (in), an output for the bitwise AND operation (out_both), an output for the bitwise OR operation (out_any), and an output for the bitwise XOR operation (out_different).  The input (in) is used to provide the data to be evaluated. The input is a 4-bit wide vector.  The output for the bitwise AND operation (out_both) is used to output the result of the bitwise AND operation. The output is a 3-bit wide vector.  The output for the bitwise OR operation (out_any) is used to output the result of the bitwise OR operation. The output is a 4-bit wide vector.  The output for the bitwise XOR operation (out_different) is used to output the result of the bitwise XOR operation. The output is a 4-bit wide vector.  The output for the bitwise AND operation (out_both) is assigned to the result of a bitwise AND operation between the input (in) vector bits 2 through 0 and the input (in) vector bits 3 through 1. The output for the bitwise OR operation (out_any) is assigned to the result of a bitwise OR operation between the input (in) vector bits 2 through 0 and the input (in) vector bits 3 through 1.  The output for the bitwise XOR operation (out_different) is assigned to the result of a bitwise XOR operation between the input (in) vector and the input (in) vector bits 3 through 1 with the input (in) vector bit 0 as an exception.


prompt:
module top_module (
	input [2:0] a,
	output reg [15:0] q
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [2:0] a,
	output reg [15:0] q
);

	always @(*)
		case (a)
			0: q = 4658;
			1: q = 44768;
			2: q = 10196;
			3: q = 23054;
			4: q = 8294;
			5: q = 25806;
			6: q = 50470;
			7: q = 12057;
		endcase

endmodule

module stimulus_gen (
	input clk,
	output logic [2:0] a,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		@(negedge clk) wavedrom_start("Unknown circuit");
			@(posedge clk) {a} <= 0;
			repeat(10) @(posedge clk,negedge clk) a <= a + 1;
		wavedrom_stop();

		repeat(100) @(posedge clk, negedge clk)
			a <= $urandom;
		$finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_q;
		int errortime_q;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [2:0] a;
	logic [15:0] q_ref;
	logic [15:0] q_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,a,q_ref,q_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.a );
	reference_module good1 (
		.a,
		.q(q_ref) );

	top_module top_module1 (
		.a,
		.q(q_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_q) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "q", stats1.errors_q, stats1.errortime_q);
		else $display("Hint: Output '%s' has no mismatches.", "q");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { q_ref } === ( { q_ref } ^ { q_dut } ^ { q_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (q_ref !== ( q_ref ^ q_dut ^ q_ref ))
		begin if (stats1.errors_q == 0) stats1.errortime_q = $time;
			stats1.errors_q = stats1.errors_q+1'b1; end

	end
endmodule

simple_description: This module assigns a 16-bit output 'q' based on the 3-bit input 'a'.

detail_description: This Verilog module is a top-level module that takes in a 3-bit input 'a' and outputs a 16-bit register 'q'. The module uses an always block to continuously check the input 'a' and assign the corresponding value to the output 'q'. The always block uses a case statement to check the value of 'a' and assign the corresponding value to 'q'. If 'a' is 0, then 'q' is assigned the value 4658. If 'a' is 1, then 'q' is assigned the value 44768. If 'a' is 2, then 'q' is assigned the value 10196. If 'a' is 3, then 'q' is assigned the value 23054. If 'a' is 4, then 'q' is assigned the value 8294. If 'a' is 5, then 'q' is assigned the value 25806. If 'a' is 6, then 'q' is assigned the value 50470. Finally, if 'a' is 7, then 'q' is assigned the value 12057.


task_id: countslow

prompt:
module top_module(
	input clk,
	input slowena,
	input reset,
	output reg [3:0] q);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input clk,
	input slowena,
	input reset,
	output reg [3:0] q);

	always @(posedge clk)
		if (reset)
			q <= 0;
		else if (slowena) begin
			if (q == 9)
				q <= 0;
			else
				q <= q+1;
		end

endmodule

module stimulus_gen (
	input clk,
	output reg slowena,
	output reg reset,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable,
	input tb_match
);

	task reset_test(input async=0);
		bit arfail, srfail, datafail;

		@(posedge clk);
		@(posedge clk) reset <= 0;
		repeat(3) @(posedge clk);

		@(negedge clk) begin datafail = !tb_match ; reset <= 1; end
		@(posedge clk) arfail = !tb_match;
		@(posedge clk) begin
			srfail = !tb_match;
			reset <= 0;
		end
		if (srfail)
			$display("Hint: Your reset doesn't seem to be working.");
		else if (arfail && (async || !datafail))
			$display("Hint: Your reset should be %0s, but doesn't appear to be.", async ? "asynchronous" : "synchronous");
		// Don't warn about synchronous reset if the half-cycle before is already wrong. It's more likely
		// a functionality error than the reset being implemented asynchronously.

	endtask

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	reg hint1;
	initial begin
		reset <= 1;
		slowena <= 1;
		wavedrom_start("Synchronous reset and counting.");
		reset_test();
		repeat(12) @(posedge clk);
		wavedrom_stop();
		@(posedge clk);

		//wavedrom_start("Testing.");
		reset <= 1;
		@(posedge clk);
		reset <= 0;
		repeat(9) @(posedge clk);
		slowena <= 0;
		@(negedge clk) hint1 = tb_match;
		repeat(3) @(posedge clk);
		if (hint1 && !tb_match) begin
			$display ("Hint: What is supposed to happen when the counter is 9 and not enabled?");
		end
		//wavedrom_stop();
		slowena <= 1;
		reset <= 1;
		@(posedge clk);
		reset <= 0;

		wavedrom_start("Enable/disable");
		repeat(15) @(posedge clk) slowena <= !($random & 1);
		wavedrom_stop();
		@(posedge clk);

		repeat(400) @(posedge clk, negedge clk) begin
			slowena <= !($random&3);
			reset <= !($random & 31);
		end
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_q;
		int errortime_q;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic slowena;
	logic reset;
	logic [3:0] q_ref;
	logic [3:0] q_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,slowena,reset,q_ref,q_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.slowena,
		.reset );
	reference_module good1 (
		.clk,
		.slowena,
		.reset,
		.q(q_ref) );

	top_module top_module1 (
		.clk,
		.slowena,
		.reset,
		.q(q_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_q) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "q", stats1.errors_q, stats1.errortime_q);
		else $display("Hint: Output '%s' has no mismatches.", "q");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { q_ref } === ( { q_ref } ^ { q_dut } ^ { q_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (q_ref !== ( q_ref ^ q_dut ^ q_ref ))
		begin if (stats1.errors_q == 0) stats1.errortime_q = $time;
			stats1.errors_q = stats1.errors_q+1'b1; end

	end
endmodule

simple_description: This module increments the output register q from 0 to 9 when slowena is high, and resets q to 0 when reset is high.

detail_description: This Verilog module is a 4-bit counter that increments its value by one every clock cycle when enabled. The module has four inputs: clk, slowena, reset, and four outputs: q. The clk input is a clock signal used to synchronize the counter. The slowena input is an enable signal that must be asserted for the counter to increment. The reset input is an asynchronous reset signal that resets the counter to 0 when asserted. The q output is a 4-bit register that stores the current value of the counter.   The module contains an always block that is triggered on the rising edge of the clock signal. Inside the always block, the module first checks the reset signal. If the reset signal is asserted, the counter is reset to 0. If the reset signal is not asserted, the module checks the slowena signal. If the slowena signal is asserted, the module checks the value of the counter. If the counter is equal to 9, the counter is reset to 0. If the counter is not equal to 9, the counter is incremented by 1. If the slowena signal is not asserted, the counter does not increment.


prompt:
module top_module (
	input in1,
	input in2,
	output logic out
);

canonical_solution:
	assign out = in1 & ~in2;
endmodule

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input in1,
	input in2,
	output logic out
);

	assign out = in1 & ~in2;
endmodule

module stimulus_gen (
	input clk,
	output logic in1, in2
);

	initial begin
		repeat(100) @(posedge clk, negedge clk) begin
			{in1, in2} <= $random;
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out;
		int errortime_out;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic in1;
	logic in2;
	logic out_ref;
	logic out_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in1,in2,out_ref,out_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in1,
		.in2 );
	reference_module good1 (
		.in1,
		.in2,
		.out(out_ref) );

	top_module top_module1 (
		.in1,
		.in2,
		.out(out_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out", stats1.errors_out, stats1.errortime_out);
		else $display("Hint: Output '%s' has no mismatches.", "out");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_ref } === ( { out_ref } ^ { out_dut } ^ { out_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_ref !== ( out_ref ^ out_dut ^ out_ref ))
		begin if (stats1.errors_out == 0) stats1.errortime_out = $time;
			stats1.errors_out = stats1.errors_out+1'b1; end

	end
endmodule

simple_description: This module assigns the output 'out' to the logical AND of input 'in1' and the logical NOT of input 'in2'.

detail_description: This module takes two input signals, in1 and in2, and produces a single output signal, out. The output signal is the logical AND of in1 and the logical NOT of in2. This means that the output signal will be high (1) only when in1 is high (1) and in2 is low (0). If either in1 or in2 is low (0), the output signal will be low (0). This module is used to perform logical operations on two input signals to produce a single output signal.


prompt:
module top_module(
	input in,
	output out);

canonical_solution:
	assign out = in;

endmodule

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input in,
	output out);

	assign out = in;

endmodule

module stimulus_gen (
	input clk,
	output reg in = 0
);

	initial begin
		repeat(100) @(posedge clk, negedge clk) begin
			in <= $random;
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out;
		int errortime_out;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic in;
	logic out_ref;
	logic out_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_ref,out_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out(out_ref) );

	top_module top_module1 (
		.in,
		.out(out_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out", stats1.errors_out, stats1.errortime_out);
		else $display("Hint: Output '%s' has no mismatches.", "out");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_ref } === ( { out_ref } ^ { out_dut } ^ { out_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_ref !== ( out_ref ^ out_dut ^ out_ref ))
		begin if (stats1.errors_out == 0) stats1.errortime_out = $time;
			stats1.errors_out = stats1.errors_out+1'b1; end

	end
endmodule

simple_description: This module assigns the output to be equal to the input.

detail_description: This Verilog module is a simple pass-through module. It has two ports, an input port and an output port. The input port is named "in" and the output port is named "out". The module assigns the output port to the same value as the input port. This means that whatever value is applied to the input port will be passed through to the output port. This module is useful for connecting two parts of a circuit together, allowing the same signal to be passed from one part to the other.


prompt:
module top_module (
	input clk,
	input in,
	input areset,
	output out
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input in,
	input areset,
	output out
);
	parameter A=0, B=1;
	reg state;
	reg next;

    always_comb begin
		case (state)
			A: next = in ? A : B;
			B: next = in ? B : A;
		endcase
    end

    always @(posedge clk, posedge areset) begin
		if (areset) state <= B;
        else state <= next;
	end

	assign out = (state==B);

endmodule

module stimulus_gen (
	input clk,
	output logic in,
	output logic areset,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable,
	input tb_match
);
	reg reset;
	assign areset = reset;
	task reset_test(input async=0);
		bit arfail, srfail, datafail;

		@(posedge clk);
		@(posedge clk) reset <= 0;
		repeat(3) @(posedge clk);

		@(negedge clk) begin datafail = !tb_match ; reset <= 1; end
		@(posedge clk) arfail = !tb_match;
		@(posedge clk) begin
			srfail = !tb_match;
			reset <= 0;
		end
		if (srfail)
			$display("Hint: Your reset doesn't seem to be working.");
		else if (arfail && (async || !datafail))
			$display("Hint: Your reset should be %0s, but doesn't appear to be.", async ? "asynchronous" : "synchronous");
		// Don't warn about synchronous reset if the half-cycle before is already wrong. It's more likely
		// a functionality error than the reset being implemented asynchronously.

	endtask

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		reset <= 1;
		in <= 0;
		@(posedge clk) reset <= 0; in <= 0;
		@(posedge clk) in <= 1;
		wavedrom_start();
			reset_test(1);
			@(posedge clk) in <= 0;
			@(posedge clk) in <= 0;
			@(posedge clk) in <= 0;
			@(posedge clk) in <= 1;
			@(posedge clk) in <= 1;
		@(negedge clk);
		wavedrom_stop();
		repeat(200) @(posedge clk, negedge clk) begin
			in <= $random;
			reset <= !($random & 7);
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out;
		int errortime_out;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic in;
	logic areset;
	logic out_ref;
	logic out_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,in,areset,out_ref,out_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in,
		.areset );
	reference_module good1 (
		.clk,
		.in,
		.areset,
		.out(out_ref) );

	top_module top_module1 (
		.clk,
		.in,
		.areset,
		.out(out_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out", stats1.errors_out, stats1.errortime_out);
		else $display("Hint: Output '%s' has no mismatches.", "out");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_ref } === ( { out_ref } ^ { out_dut } ^ { out_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_ref !== ( out_ref ^ out_dut ^ out_ref ))
		begin if (stats1.errors_out == 0) stats1.errortime_out = $time;
			stats1.errors_out = stats1.errors_out+1'b1; end

	end
endmodule

simple_description: This module implements a simple flip-flop which toggles between two states based on the input signal.

detail_description: The top module is a simple state machine that has two states, A and B. The state transitions are determined by the input signal 'in'. When the state is A, if 'in' is high, the next state is A, otherwise the next state is B. When the state is B, if 'in' is high, the next state is B, otherwise the next state is A. The state is updated on the rising edge of the clock signal 'clk' and reset to state B on the rising edge of the reset signal 'areset'. The output 'out' is high when the state is B and low otherwise.


task_id: dualedge

prompt:
module top_module(
	input clk,
	input d,
	output reg q);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input clk,
	input d,
	output reg q);

	/*always @(posedge clk, negedge clk) begin
		q <= d;
	end*/

	reg qp, qn;
    always @(posedge clk)
        qp <= d;
    always @(negedge clk)
        qn <= d;
    // assign q = clk ? qp : qn;  // This causes q to change too early when clk changes. Need delay by delta cycle
    always @(*)
        q <= clk ? qp : qn;
endmodule

module stimulus_gen (
	input clk,
	output reg d,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		d <= 1'b0;
		@(negedge clk) wavedrom_start();
			repeat(20) @(posedge clk, negedge clk)
				d <= $random>>2;
		@(negedge clk) wavedrom_stop();
		repeat(200) @(posedge clk, negedge clk) begin
			d <= $random;
		end
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_q;
		int errortime_q;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic d;
	logic q_ref;
	logic q_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,d,q_ref,q_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.d );
	reference_module good1 (
		.clk,
		.d,
		.q(q_ref) );

	top_module top_module1 (
		.clk,
		.d,
		.q(q_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_q) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "q", stats1.errors_q, stats1.errortime_q);
		else $display("Hint: Output '%s' has no mismatches.", "q");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { q_ref } === ( { q_ref } ^ { q_dut } ^ { q_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (q_ref !== ( q_ref ^ q_dut ^ q_ref ))
		begin if (stats1.errors_q == 0) stats1.errortime_q = $time;
			stats1.errors_q = stats1.errors_q+1'b1; end

	end
endmodule

simple_description: This module is a basic D-Flip-Flop that synchronizes the input signal 'd' to the clock signal 'clk' and outputs it to 'q'.

detail_description: This Verilog module is used to synchronize the signal d with the clock signal clk. It has three ports: clk, d, and q. The clk port is an input port for the clock signal, the d port is an input port for the signal to be synchronized, and the q port is an output port for the synchronized signal.   The module contains two registers qp and qn. The register qp is always updated with the value of d when the clock signal clk is positive. The register qn is always updated with the value of d when the clock signal clk is negative.   The output port q is assigned the value of either qp or qn depending on the value of clk. If clk is positive, q is assigned the value of qp. If clk is negative, q is assigned the value of qn. This ensures that the output signal q is synchronized with the clock signal clk.


task_id: xnorgate

prompt:
module top_module(
	input a,
	input b,
	output out
);

canonical_solution:
	assign out = ~(a^b);

endmodule

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input a,
	input b,
	output out
);

	assign out = ~(a^b);

endmodule

module stimulus_gen (
	input clk,
	output reg a, b,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		int count; count = 0;
		{a,b} <= 1'b0;
		wavedrom_start("XNOR gate");
		repeat(10) @(posedge clk)
			{a,b} <= count++;
		wavedrom_stop();

		repeat(200) @(posedge clk, negedge clk)
			{b,a} <= $random;

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out;
		int errortime_out;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic a;
	logic b;
	logic out_ref;
	logic out_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,a,b,out_ref,out_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.a,
		.b );
	reference_module good1 (
		.a,
		.b,
		.out(out_ref) );

	top_module top_module1 (
		.a,
		.b,
		.out(out_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out", stats1.errors_out, stats1.errortime_out);
		else $display("Hint: Output '%s' has no mismatches.", "out");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_ref } === ( { out_ref } ^ { out_dut } ^ { out_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_ref !== ( out_ref ^ out_dut ^ out_ref ))
		begin if (stats1.errors_out == 0) stats1.errortime_out = $time;
			stats1.errors_out = stats1.errors_out+1'b1; end

	end
endmodule

simple_description: This module assigns the output to the inverse of the exclusive-or of the inputs a and b.

detail_description: This module is a simple two-input, one-output logic circuit. It takes two inputs, a and b, and produces an output, out. The output is the logical negation of the exclusive-or (XOR) of the two inputs. This means that the output will be true (1) when the inputs are not equal and false (0) when the inputs are equal. The module is implemented using a single assign statement, which assigns the output to the logical negation of the XOR of the two inputs.


prompt:
module top_module(
	input x,
	input y,
	output z);

canonical_solution:
	assign z = x|~y;

endmodule

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input x,
	input y,
	output z);

	assign z = x|~y;

endmodule

module stimulus_gen (
	input clk,
	output logic x,
	output logic y
);

	always @(posedge clk, negedge clk)
		{x, y} <= $random % 4;

	initial begin
		repeat(100) @(negedge clk);
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_z;
		int errortime_z;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic x;
	logic y;
	logic z_ref;
	logic z_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,x,y,z_ref,z_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.x,
		.y );
	reference_module good1 (
		.x,
		.y,
		.z(z_ref) );

	top_module top_module1 (
		.x,
		.y,
		.z(z_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_z) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "z", stats1.errors_z, stats1.errortime_z);
		else $display("Hint: Output '%s' has no mismatches.", "z");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { z_ref } === ( { z_ref } ^ { z_dut } ^ { z_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (z_ref !== ( z_ref ^ z_dut ^ z_ref ))
		begin if (stats1.errors_z == 0) stats1.errortime_z = $time;
			stats1.errors_z = stats1.errors_z+1'b1; end

	end
endmodule

detail_description:
    The top module is a logic gate that receives x and y inputs and returns the z output.
    The x input is the a input for the first gate and the b input for the second gate.
    The y input is the b input for the first gate and the a input for the second gate.
    The output of the first gate is the a input for the third gate.
    The output of the second gate is the b input for the third gate.
    The output of the third gate is the z output.


prompt:
module top_module(
	input clk,
	input load,
	input [1:0] ena,
	input [99:0] data,
	output reg [99:0] q);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input clk,
	input load,
	input [1:0] ena,
	input [99:0] data,
	output reg [99:0] q);

	always @(posedge clk) begin
		if (load)
			q <= data;
		else if (ena == 2'h1)
			q <= {q[0], q[99:1]};
		else if (ena == 2'h2)
			q <= {q[98:0], q[99]};
	end
endmodule

module stimulus_gen (
	input clk,
	output reg load,
	output reg[1:0] ena,
	output reg[99:0] data
);

	always @(posedge clk)
		data <= {$random,$random,$random,$random};

	initial begin
		load <= 1;
		@(posedge clk);
		@(posedge clk);
		@(posedge clk);
		repeat(4000) @(posedge clk, negedge clk) begin
			load <= !($random & 31);
			ena <= $random;
		end
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_q;
		int errortime_q;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic load;
	logic [1:0] ena;
	logic [99:0] data;
	logic [99:0] q_ref;
	logic [99:0] q_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,load,ena,data,q_ref,q_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.load,
		.ena,
		.data );
	reference_module good1 (
		.clk,
		.load,
		.ena,
		.data,
		.q(q_ref) );

	top_module top_module1 (
		.clk,
		.load,
		.ena,
		.data,
		.q(q_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_q) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "q", stats1.errors_q, stats1.errortime_q);
		else $display("Hint: Output '%s' has no mismatches.", "q");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { q_ref } === ( { q_ref } ^ { q_dut } ^ { q_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (q_ref !== ( q_ref ^ q_dut ^ q_ref ))
		begin if (stats1.errors_q == 0) stats1.errortime_q = $time;
			stats1.errors_q = stats1.errors_q+1'b1; end

	end
endmodule

simple_description: This module loads data into the output register q when the load input is asserted, and shifts the data in q one bit to the left or right when the ena input is asserted.

detail_description: This Verilog module is a top-level module that is used to shift the bits of the input data. The module has five ports, a clock input (clk), a load input (load), an enable input (ena), a data input (data) and a data output (q).   The clock input (clk) is used to synchronize the module and is used to trigger the state transitions.  The load input (load) is used to control when the data is loaded into the output register (q). When the load input is high, the data input (data) is loaded into the output register (q).  The enable input (ena) is used to control the direction of the shift. When the enable input is set to 2'h1, the output register (q) is shifted to the left. When the enable input is set to 2'h2, the output register (q) is shifted to the right.  The data input (data) is used to provide the data to be shifted. The data input is a 100-bit wide vector.  The data output (q) is used to output the shifted data. The data output is a 100-bit wide vector.  The module is always triggered on the rising edge of the clock input (clk). When the load input is high, the data input (data) is loaded into the output register (q). When the enable input is set to 2'h1, the output register (q) is shifted to the left. When the enable input is set to 2'h2, the output register (q) is shifted to the right.


prompt:
module top_module(
	input clk,
	input reset,
	output reg [9:0] q);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input clk,
	input reset,
	output reg [9:0] q);

	always @(posedge clk)
		if (reset || q == 999)
			q <= 0;
		else
			q <= q+1;

endmodule

module stimulus_gen (
	input clk,
	output reg reset,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable,
	input tb_match
);
	task reset_test(input async=0);
		bit arfail, srfail, datafail;

		@(posedge clk);
		@(posedge clk) reset <= 0;
		repeat(3) @(posedge clk);

		@(negedge clk) begin datafail = !tb_match ; reset <= 1; end
		@(posedge clk) arfail = !tb_match;
		@(posedge clk) begin
			srfail = !tb_match;
			reset <= 0;
		end
		if (srfail)
			$display("Hint: Your reset doesn't seem to be working.");
		else if (arfail && (async || !datafail))
			$display("Hint: Your reset should be %0s, but doesn't appear to be.", async ? "asynchronous" : "synchronous");
		// Don't warn about synchronous reset if the half-cycle before is already wrong. It's more likely
		// a functionality error than the reset being implemented asynchronously.

	endtask

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		reset <= 1;
		wavedrom_start("Synchronous reset");
		reset_test();
		repeat(5) @(posedge clk);
		wavedrom_stop();

		reset <= 0;

		repeat(989) @(negedge clk);
		wavedrom_start("Wrap around behaviour");
		repeat(14)@(posedge clk);
		wavedrom_stop();

		repeat(2000) @(posedge clk, negedge clk) begin
			reset <= !($random & 127);
		end
		reset <= 0;
		repeat(2000) @(posedge clk);

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_q;
		int errortime_q;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic reset;
	logic [9:0] q_ref;
	logic [9:0] q_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,reset,q_ref,q_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.reset );
	reference_module good1 (
		.clk,
		.reset,
		.q(q_ref) );

	top_module top_module1 (
		.clk,
		.reset,
		.q(q_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_q) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "q", stats1.errors_q, stats1.errortime_q);
		else $display("Hint: Output '%s' has no mismatches.", "q");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { q_ref } === ( { q_ref } ^ { q_dut } ^ { q_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (q_ref !== ( q_ref ^ q_dut ^ q_ref ))
		begin if (stats1.errors_q == 0) stats1.errortime_q = $time;
			stats1.errors_q = stats1.errors_q+1'b1; end

	end
endmodule

simple_description: This module increments the output register q by 1 on each rising edge of the clock signal, resetting it to 0 when the reset signal is asserted or when q reaches 999.

detail_description: This Verilog module is a simple counter that counts from 0 to 999. It has three ports, an input clock (clk), an input reset, and an output register (q). The output register is 10 bits wide, allowing it to count up to 999.   The module is always triggered on the positive edge of the clock. When the reset input is active, the output register is reset to 0. Otherwise, the output register is incremented by 1. When the output register reaches 999, it is reset to 0 and the counting cycle begins again.


task_id: notgate

prompt:
module top_module(
	input in,
	output out
);

canonical_solution:
	assign out = ~in;

endmodule

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input in,
	output out
);

	assign out = ~in;

endmodule

module stimulus_gen (
	input clk,
	output reg in,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		in <= 1'b0;
		wavedrom_start("Inversion");
		repeat(20) @(posedge clk)
			in <= $random;
		wavedrom_stop();

		repeat(200) @(posedge clk, negedge clk)
			in <= $random;

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out;
		int errortime_out;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic in;
	logic out_ref;
	logic out_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_ref,out_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out(out_ref) );

	top_module top_module1 (
		.in,
		.out(out_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out", stats1.errors_out, stats1.errortime_out);
		else $display("Hint: Output '%s' has no mismatches.", "out");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_ref } === ( { out_ref } ^ { out_dut } ^ { out_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_ref !== ( out_ref ^ out_dut ^ out_ref ))
		begin if (stats1.errors_out == 0) stats1.errortime_out = $time;
			stats1.errors_out = stats1.errors_out+1'b1; end

	end
endmodule

simple_description: This module inverts the input signal and assigns it to the output.

detail_description: This Verilog module is a simple combinational circuit that takes an input and produces an inverted output. The input port is named "in" and the output port is named "out". The output is assigned to the inverse of the input, meaning that if the input is 0, the output will be 1, and if the input is 1, the output will be 0. This module does not have any internal logic or state transitions, it simply takes the input and inverts it.


prompt:
module top_module (
	input in,
	input [9:0] state,
	output [9:0] next_state,
	output out1,
	output out2);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input in,
	input [9:0] state,
	output [9:0] next_state,
	output out1,
	output out2);

	assign out1 = state[8] | state[9];
	assign out2 = state[7] | state[9];

	assign next_state[0] = !in && (|state[4:0] | state[7] | state[8] | state[9]);
	assign next_state[1] = in && (state[0] | state[8] | state[9]);
	assign next_state[2] = in && state[1];
	assign next_state[3] = in && state[2];
	assign next_state[4] = in && state[3];
	assign next_state[5] = in && state[4];
	assign next_state[6] = in && state[5];
	assign next_state[7] = in && (state[6] | state[7]);
	assign next_state[8] = !in && state[5];
	assign next_state[9] = !in && state[6];

endmodule

module stimulus_gen (
	input clk,
	output logic in,
	output logic [9:0] state,
	input tb_match,
	input [9:0] next_state_ref,
	input [9:0] next_state_dut,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	int errored1 = 0;
	int errored2 = 0;
	int onehot_error = 0;
	reg [9:0] state_error = 10'h0;

	initial begin
		repeat(2) @(posedge clk);
		forever @(posedge clk, negedge clk)
			state_error <= state_error | (next_state_ref^next_state_dut);
	end

	initial begin
		state <= 0;

		@(negedge clk) wavedrom_start();
		for (int i=0;i<10;i++) begin
			@(negedge clk, posedge clk);
			state <= 1<< i;
			in <= 0;
		end
		for (int i=0;i<10;i++) begin
			@(negedge clk, posedge clk);
			state <= 1<< i;
			in <= 1;
		end
		@(negedge clk) wavedrom_stop();

		// Test the one-hot cases first.
		repeat(200) @(posedge clk, negedge clk) begin
			state <= 1<< ($unsigned($random) % 10);
			in <= $random;
			if (!tb_match) onehot_error++;
		end

		// Two-hot.
		errored1 = 0;
		repeat(400) @(posedge clk, negedge clk) begin
			state <= (1<< ($unsigned($random) % 10)) | (1<< ($unsigned($random) % 10));
			in <= $random;
			if (!tb_match)
				errored1++;
		end

		if (!onehot_error && errored1)
			$display ("Hint: Your circuit passed when given only one-hot inputs, but not with two-hot inputs.");

		// Random.
		errored2 = 0;
		repeat(800) @(posedge clk, negedge clk) begin
			state <= $random;
			in <= $random;
			if (!tb_match)
				errored2++;
		end
		if (!onehot_error && errored2)
			$display ("Hint: Your circuit passed when given only one-hot inputs, but not with random inputs.");

		if (!onehot_error && (errored1 || errored2))
			$display("Hint: Are you doing something more complicated than deriving state transition equations by inspection?\n");

		for (int i=0;i<$bits(state_error);i++)
			$display("Hint: next_state[%0d] is %s.", i, (state_error[i] === 1'b0) ? "correct": "incorrect");

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_next_state;
		int errortime_next_state;
		int errors_out1;
		int errortime_out1;
		int errors_out2;
		int errortime_out2;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic in;
	logic [9:0] state;
	logic [9:0] next_state_ref;
	logic [9:0] next_state_dut;
	logic out1_ref;
	logic out1_dut;
	logic out2_ref;
	logic out2_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,state,next_state_ref,next_state_dut,out1_ref,out1_dut,out2_ref,out2_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in,
		.state );
	reference_module good1 (
		.in,
		.state,
		.next_state(next_state_ref),
		.out1(out1_ref),
		.out2(out2_ref) );

	top_module top_module1 (
		.in,
		.state,
		.next_state(next_state_dut),
		.out1(out1_dut),
		.out2(out2_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_next_state) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "next_state", stats1.errors_next_state, stats1.errortime_next_state);
		else $display("Hint: Output '%s' has no mismatches.", "next_state");
		if (stats1.errors_out1) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out1", stats1.errors_out1, stats1.errortime_out1);
		else $display("Hint: Output '%s' has no mismatches.", "out1");
		if (stats1.errors_out2) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out2", stats1.errors_out2, stats1.errortime_out2);
		else $display("Hint: Output '%s' has no mismatches.", "out2");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { next_state_ref, out1_ref, out2_ref } === ( { next_state_ref, out1_ref, out2_ref } ^ { next_state_dut, out1_dut, out2_dut } ^ { next_state_ref, out1_ref, out2_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (next_state_ref !== ( next_state_ref ^ next_state_dut ^ next_state_ref ))
		begin if (stats1.errors_next_state == 0) stats1.errortime_next_state = $time;
			stats1.errors_next_state = stats1.errors_next_state+1'b1; end
		if (out1_ref !== ( out1_ref ^ out1_dut ^ out1_ref ))
		begin if (stats1.errors_out1 == 0) stats1.errortime_out1 = $time;
			stats1.errors_out1 = stats1.errors_out1+1'b1; end
		if (out2_ref !== ( out2_ref ^ out2_dut ^ out2_ref ))
		begin if (stats1.errors_out2 == 0) stats1.errortime_out2 = $time;
			stats1.errors_out2 = stats1.errors_out2+1'b1; end

	end
endmodule

detail_description:
the top module has a input in, a 10 bit input state, 10bit output next_state, 2 output out1 and out2.

out1 is equal to state[8] or state[9], out2 is equal to state[7] or state[9]
next_state[0] is equal to not(in) and (the or of state[4:0], state[7], state[8], state[9])
next_state[1] is equal to in and the or of state[0], state[8] and state[9]
next_state[2] is equal to in and state[1]
next_state[3] is equal to in and state[2]
next_state[4] is equal to in and state[3]
next_state[5] is equal to in and state[4]
next_state[6] is equal to in and state[5]
next_state[7] is equal to in and the or of state[6] and state[7]
next_state[8] is equal to not(in) and state[5]
next_state[9] is equal to not(in) and state[6]


prompt:
module top_module (
	input clk,
	input j,
	input k,
	output reg Q
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input j,
	input k,
	output reg Q
);

	always @(posedge clk)
		Q <= j&~Q | ~k&Q;

endmodule

module stimulus_gen (
	input clk,
	output logic j, k,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		{j,k} <= 1;

		@(negedge clk) wavedrom_start();
			@(posedge clk) {j,k} <= 2'h1;
			@(posedge clk) {j,k} <= 2'h2;
			@(posedge clk) {j,k} <= 2'h3;
			@(posedge clk) {j,k} <= 2'h3;
			@(posedge clk) {j,k} <= 2'h3;
			@(posedge clk) {j,k} <= 2'h0;
			@(posedge clk) {j,k} <= 2'h0;
			@(posedge clk) {j,k} <= 2'h0;
			@(posedge clk) {j,k} <= 2'h2;
			@(posedge clk) {j,k} <= 2'h2;
		@(negedge clk) wavedrom_stop();
		repeat(400) @(posedge clk, negedge clk)
			{j,k} <= $random;
		$finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_Q;
		int errortime_Q;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic j;
	logic k;
	logic Q_ref;
	logic Q_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,j,k,Q_ref,Q_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.j,
		.k );
	reference_module good1 (
		.clk,
		.j,
		.k,
		.Q(Q_ref) );

	top_module top_module1 (
		.clk,
		.j,
		.k,
		.Q(Q_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_Q) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "Q", stats1.errors_Q, stats1.errortime_Q);
		else $display("Hint: Output '%s' has no mismatches.", "Q");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { Q_ref } === ( { Q_ref } ^ { Q_dut } ^ { Q_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (Q_ref !== ( Q_ref ^ Q_dut ^ Q_ref ))
		begin if (stats1.errors_Q == 0) stats1.errortime_Q = $time;
			stats1.errors_Q = stats1.errors_Q+1'b1; end

	end
endmodule

simple_description: This Verilog module creates a JK flip-flop which will toggle its output Q based on the inputs j and k.

detail_description: This Verilog module implements a JK flip-flop, which is a type of sequential logic circuit. It has three inputs (clk, j, and k) and one output (Q). The clock input (clk) is used to synchronize the circuit and the other two inputs (j and k) are used to control the state of the output (Q).   The module is declared with the keyword "module" followed by the name of the module ("top") and the list of ports (inputs and outputs). The module body contains an always block, which is triggered on the rising edge of the clock signal (posedge clk). Inside the always block, the output (Q) is assigned a value based on the logic expression given. The expression is a combination of two logic operations, an AND operation and an OR operation. The AND operation is between the input j and the NOT of the output Q, and the OR operation is between the NOT of the input k and the output Q.   This expression implements the JK flip-flop logic. When the input j is high and the input k is low, the output Q will be set to the value of j. When the input j is low and the input k is high, the output Q will be reset to the value of 0. When both the inputs j and k are high, the output Q will toggle its value. When both the inputs j and k are low, the output Q will remain unchanged.


prompt:
module top_module (
	input [2:0] in,
	output [1:0] out
);

test:
`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [2:0] in,
	output [1:0] out
);

	assign out = in[0]+in[1]+in[2];

endmodule

module stimulus_gen (
	input clk,
	output logic [2:0] in,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		in <= 7;
		@(negedge clk);
		wavedrom_start();
			repeat(9) @(posedge clk) in <= in + 1'b1;
		@(negedge clk);
		wavedrom_stop();
		repeat(200) @(posedge clk, negedge clk)
			in <= $random;
		$finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out;
		int errortime_out;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [2:0] in;
	logic [1:0] out_ref;
	logic [1:0] out_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_ref,out_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out(out_ref) );

	top_module top_module1 (
		.in,
		.out(out_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out", stats1.errors_out, stats1.errortime_out);
		else $display("Hint: Output '%s' has no mismatches.", "out");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_ref } === ( { out_ref } ^ { out_dut } ^ { out_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_ref !== ( out_ref ^ out_dut ^ out_ref ))
		begin if (stats1.errors_out == 0) stats1.errortime_out = $time;
			stats1.errors_out = stats1.errors_out+1'b1; end

	end
endmodule

simple_description: This module takes in a 3-bit input and outputs a 2-bit sum.

detail_description: This Verilog module is a simple combinational logic module that takes three input bits and produces two output bits. The module is named top and it has three inputs, in[2:0], and two outputs, out[1:0]. The output of the module is calculated by adding the three input bits together. The result of the addition is stored in the two output bits, out[1:0]. The most significant bit of the result is stored in out[1] and the least significant bit is stored in out[0]. The module does not have any internal state and it does not use any instantiated modules.