module decoder_3to8( input [2:] in, output reg [7:] out ); always @(*) begin case(in) 3'b000: out = 8'b00000001; 3'b001: out = 8'b00000010; 3'b010: out = 8'b00000100; 3'b011: out = 8'b00001000; 3'b100: out = 8'b00010000; 3'b101: out = 8'b00100000; 3'b110: out = 8'b01000000; 3'b111: out = 8'b10000000; default: out = 8'b00000000; endcase end endmodule写出该代码的测试文件
时间: 2024-03-24 09:38:47 浏览: 20
以下是一个decoder_3to8模块的测试文件示例:
```
module decoder_3to8_tb;
// Inputs
reg [2:0] in;
// Outputs
wire [7:0] out;
// Instantiate the decoder module
decoder_3to8 dut (
.in(in),
.out(out)
);
// Test cases
initial begin
// Test case 1: in = 3'b000
#10 in = 3'b000;
#20 $display("Test case 1: in = %b, out = %b", in, out);
// Test case 2: in = 3'b001
#10 in = 3'b001;
#20 $display("Test case 2: in = %b, out = %b", in, out);
// Test case 3: in = 3'b010
#10 in = 3'b010;
#20 $display("Test case 3: in = %b, out = %b", in, out);
// Test case 4: in = 3'b011
#10 in = 3'b011;
#20 $display("Test case 4: in = %b, out = %b", in, out);
// Test case 5: in = 3'b100
#10 in = 3'b100;
#20 $display("Test case 5: in = %b, out = %b", in, out);
// Test case 6: in = 3'b101
#10 in = 3'b101;
#20 $display("Test case 6: in = %b, out = %b", in, out);
// Test case 7: in = 3'b110
#10 in = 3'b110;
#20 $display("Test case 7: in = %b, out = %b", in, out);
// Test case 8: in = 3'b111
#10 in = 3'b111;
#20 $display("Test case 8: in = %b, out = %b", in, out);
end
endmodule
```
该测试文件包含了8个测试用例,每个测试用例都会将输入信号 `in` 设置为一个不同的3位二进制数,并在一段时间后打印出输入信号和输出信号的值。这个测试文件可以用于验证decoder_3to8模块的正确性。需要注意的是,测试文件的波形仿真时间需要足够长,以确保每个测试用例都能充分运行和观察。
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