写一个测试数据总线位宽16bit,地址位宽18bit先写后读的EMIF接口的testbench测试程序
时间: 2024-05-13 13:14:28 浏览: 216
基于EMIF接口的数据采集系统的设计
以下是一个可能的测试程序:
```verilog
`timescale 1ns / 1ps
module testbench;
// Parameters
parameter DATA_WIDTH = 16;
parameter ADDR_WIDTH = 18;
// Inputs
reg clk;
reg reset;
reg [ADDR_WIDTH-1:0] addr;
reg [DATA_WIDTH-1:0] write_data;
reg write_enable;
reg read_enable;
// Outputs
wire [DATA_WIDTH-1:0] read_data;
// Instantiate DUT
EMIF #(DATA_WIDTH, ADDR_WIDTH) dut (
.clk(clk),
.reset(reset),
.addr(addr),
.write_data(write_data),
.write_enable(write_enable),
.read_enable(read_enable),
.read_data(read_data)
);
// Clock generation
always #5 clk = ~clk;
// Test case
initial begin
// Reset
reset = 1;
#10 reset = 0;
// Write
write_enable = 1;
for (int i = 0; i < (1<<ADDR_WIDTH); i++) begin
addr = i;
write_data = i & ((1<<DATA_WIDTH)-1);
#5;
end
write_enable = 0;
// Read
read_enable = 1;
for (int i = 0; i < (1<<ADDR_WIDTH); i++) begin
addr = i;
if (read_data !== (i & ((1<<DATA_WIDTH)-1))) begin
$display("Error at address %h: expected %h, got %h", addr, i & ((1<<DATA_WIDTH)-1), read_data);
$finish;
end
#5;
end
read_enable = 0;
// Finish
$display("Test passed");
$finish;
end
endmodule
```
该测试程序首先将 EMIF 重置,然后进行写操作,将每个地址写入其地址值的低16位。接下来进行读操作,读取每个地址并验证其值是否等于该地址的低16位。如果读取到的值与预期不符,则会输出错误信息并结束测试。最后,如果测试通过,则输出“Test passed”并结束仿真。
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