异步fifo verilog源码与testbench
时间: 2023-12-17 20:01:01 浏览: 144
异步FIFO是一种常见的数字电路设计,用来实现数据在不同时钟域之间的传输。Verilog是一种硬件描述语言,用于设计和模拟数字逻辑电路。下面是一个异步FIFO的Verilog源码和相应的测试台代码的示例:
Verilog异步FIFO源码:
```verilog
module AsyncFIFO (
input wire clk_wr,
input wire reset,
input wire enable,
input wire data_in,
output wire full,
output wire empty,
output reg data_out
);
parameter WIDTH = 8; // 数据位宽
parameter DEPTH = 16; // FIFO深度
reg [WIDTH-1:0] memory[0:DEPTH-1];
reg [WIDTH-1:0] read_pointer, write_pointer;
always @(posedge clk_wr or posedge reset) begin
if (reset) begin
read_pointer <= 0;
write_pointer <= 0;
data_out <= 0;
end else if (enable) begin
if (~full) begin
memory[write_pointer] <= data_in;
write_pointer <= write_pointer + 1;
end
if (~empty) begin
data_out <= memory[read_pointer];
read_pointer <= read_pointer + 1;
end
end
end
assign full = (write_pointer - read_pointer) == DEPTH;
assign empty = (write_pointer == read_pointer);
endmodule
```
Verilog异步FIFO测试台代码:
```verilog
module AsyncFIFOTest;
reg clk_wr;
reg reset;
reg enable;
reg data_in;
wire full;
wire empty;
wire data_out;
AsyncFIFO dut (
.clk_wr(clk_wr),
.reset(reset),
.enable(enable),
.data_in(data_in),
.full(full),
.empty(empty),
.data_out(data_out)
);
initial begin
clk_wr = 0;
reset = 1;
enable = 0;
data_in = 0;
#2 reset = 0;
// 写入测试数据
#2 enable = 1;
#2 data_in = 1;
#2;
#2 data_in = 2;
#2;
#2 data_in = 3;
#2 enable = 0;
// 读取测试数据
#2 enable = 1;
#2 enable = 0;
// 检查输出数据
$display("data_out: %d", data_out);
#2;
$display("empty: %b", empty);
$finish;
end
always begin
#1 clk_wr = ~clk_wr;
end
endmodule
```
以上是一个简单的8位宽、16深度的异步FIFO模块和相应的测试台代码。测试台首先初始化FIFO,然后写入数据1、2、3,最后读取数据并检查输出数据和空状态。
这是一个只包含基本功能的示例,实际应用中可能还需要添加写入满和读取空的异常处理等功能。同时,测试台代码也可以根据具体需求进行修改和扩展以进行更全面的测试。
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