用Verilog实现同步清零,同步置数功能,4位模16计数器的RTL和测试文件
时间: 2024-03-27 15:34:59 浏览: 11
以下是使用 Verilog 实现同步清零,同步置数功能,4位模16计数器的 RTL 和测试文件的示例代码:
```verilog
// 4-bit synchronous counter with synchronous clear and set
module synchronous_counter (
input clk, // clock input
input rst, // synchronous reset input
input set, // synchronous set input
input clear, // synchronous clear input
output reg [3:0] q // counter output
);
always @(posedge clk) begin
if (rst) begin
q <= 4'b0000; // reset counter to 0
end else if (set) begin
q <= 4'b1111; // set counter to 15
end else if (clear) begin
q <= 4'b0000; // clear counter to 0
end else begin
q <= q + 1; // increment counter
end
end
endmodule
```
测试文件:
```verilog
// Testbench for 4-bit synchronous counter
module testbench;
// Inputs
reg clk;
reg rst;
reg set;
reg clear;
// Outputs
wire [3:0] q;
// Instantiate the design under test (DUT)
synchronous_counter dut (
.clk(clk),
.rst(rst),
.set(set),
.clear(clear),
.q(q)
);
initial begin
// Initialize inputs
clk = 0;
rst = 1;
set = 0;
clear = 0;
// Wait a few clock cycles
#5;
// Deassert reset
rst = 0;
// Wait a few more clock cycles
#5;
// Test counter with no set or clear signals
for (int i = 0; i < 16; i = i + 1) begin
assert (q == i) else $error("Error: Expected q to be %d, but got %d", i, q);
#1 clk = ~clk; // toggle clock
end
// Reset the counter to 0
clear = 1;
#1 clear = 0;
// Wait a few more clock cycles
#5;
// Test counter after clearing
for (int i = 0; i < 16; i = i + 1) begin
assert (q == 0) else $error("Error: Expected q to be 0, but got %d", q);
#1 clk = ~clk; // toggle clock
end
// Set the counter to 15
set = 1;
#1 set = 0;
// Wait a few more clock cycles
#5;
// Test counter after setting
for (int i = 0; i < 16; i = i + 1) begin
assert (q == 15) else $error("Error: Expected q to be 15, but got %d", q);
#1 clk = ~clk; // toggle clock
end
$display("Testbench completed successfully");
$finish;
end
endmodule
```
这个 RTL 模块和测试文件可以在仿真工具中运行,以验证其功能。注意,在测试文件中,我们使用了 Verilog 的 $display 任务来输出测试结果。