1、Verilog描述具有有非同步清0、非同步置1的D觸發器

//同步復位、置位D觸發器模組描述
module D_synctrigger(clk,rst,set,D,Q);
	input clk,rst,set,D;
	output Q;
	
	reg Q;//暫存器定義
	always @(posedge clk)
	begin
		if(rst) //同步清0，高有效 
		begin
			Q <= 1'b0;
		end
		else if(set) //同步置1，高有效
		begin
			Q <= 1'b1;
		end
		else
		begin
			Q <= D;
		end	
	end

endmodule
 

2、Testbench描述

//同步復位、置位D觸發器Testbench描述
`timescale 1ns/1ns

module D_synctrigger_tb;
	reg clk,rst,set,D;
	wire Q;
	
	D_synctrigger u1(.clk(clk),.rst(rst),.set(set),.D(D),.Q(Q));
	initial
	begin
		clk = 0;
		rst = 0;
		set = 0;
		
		forever
		begin
			#60 D <= 1;
			#22 D <= 0;
			#2  D <= 1;
			#2  D <= 0;
			#16 D <= 0;	
		end
	end
	always #940 rst <= ~rst;
	always #360 set <= ~set;
	always #20  clk <= ~clk;
		
endmodule