状态为000,001,010,011,100,101的模6同步计数器verliog程序及测试程序
时间: 2024-01-01 12:06:32 浏览: 31
以下是一个基于 Verilog 的模6同步计数器的代码,以及一个简单的测试程序:
```verilog
module mod6_sync_counter(
input clk,
input rst,
output reg[2:0] count
);
reg[2:0] next_count;
always @(posedge clk or posedge rst) begin
if (rst) begin
next_count <= 3'b000;
end else begin
case (count)
3'b000: next_count <= 3'b001;
3'b001: next_count <= 3'b010;
3'b010: next_count <= 3'b011;
3'b011: next_count <= 3'b100;
3'b100: next_count <= 3'b101;
3'b101: next_count <= 3'b000;
endcase
end
end
always @(posedge clk or posedge rst) begin
if (rst) begin
count <= 3'b000;
end else begin
count <= next_count;
end
end
endmodule
```
以下是测试程序,使用 Verilog testbench 测试计数器的输出是否符合预期:
```verilog
module mod6_sync_counter_tb;
reg clk;
reg rst;
wire[2:0] count;
mod6_sync_counter dut(
.clk(clk),
.rst(rst),
.count(count)
);
initial begin
clk = 0;
forever #5 clk = ~clk;
end
initial begin
rst = 1;
#10 rst = 0;
end
initial begin
#10;
$display("Count: %b", count);
#10;
$display("Count: %b", count);
#10;
$display("Count: %b", count);
#10;
$display("Count: %b", count);
#10;
$display("Count: %b", count);
#10;
$display("Count: %b", count);
#10;
$finish;
end
endmodule
```
该测试程序会在计数器被重置后,每隔 10 个时钟周期打印一次计数器的值,一共打印 6 次,即测试计数器是否能够循环计数 0–5 的数字。