reg [size-1:0] delay_sum;wire [size-1:0] x, sum;assign sum=x+delay_sum;… always @ (posedge clock)delay _sum <- sum;
时间: 2023-06-24 11:09:20 浏览: 39
这段代码是一个 Verilog HDL 代码,实现了一个寄存器 delay_sum,用于存储上一次时钟上升沿到达时的 sum 值。同时,还定义了两个位宽为 size 的向量 x 和 sum。其中,assign sum=x+delay_sum; 表示 sum 的值等于 x 和 delay_sum 的和。在时钟上升沿触发的 always 块中,更新 delay_sum 的值为 sum,这样就可以实现数据的暂存功能。需要注意的是,这里的 + 操作是向量的加法,即对应位相加。
相关问题
将这段verilog代码写成一个模块 reg [size-1:0] delay_sum; wire [size-1:0] x, sum; assign sum=x+delay_sum; always @ (posedge clock) delay _sum <- sum;
下面是将这段Verilog代码写成一个模块的示例:
```
module delay_module (
input clk,
input [size-1:0] x,
output reg [size-1:0] delay_sum
);
wire [size-1:0] sum;
assign sum = x + delay_sum;
always @(posedge clk) begin
delay_sum <= sum;
end
endmodule
```
在这个模块中,我们通过输入信号 `x` 和时钟信号 `clk` 来计算 `sum`,然后在每个时钟上升沿的时候将 `sum` 的值赋给 `delay_sum`,以实现 `delay_sum` 的功能。
//XW_crc_p.v `pragma protect begin module DW_crc_p( data_in, crc_in, crc_ok, crc_out ); parameter integer data_width = 16; parameter integer poly_size = 16; parameter integer crc_cfg = 7; parameter integer bit_order = 3; parameter integer poly_coef0 = 4129; parameter integer poly_coef1 = 0; parameter integer poly_coef2 = 0; parameter integer poly_coef3 = 0; input [data_width-1:0] data_in; input [poly_size-1:0] crc_in; output crc_ok; output [poly_size-1:0] crc_out; `define DW_max_data_crc_1 (data_width>poly_size?data_width:poly_size) wire [poly_size-1:0] crc_in_inv; wire [poly_size-1:0] crc_reg; wire [poly_size-1:0] crc_out_inv; wire [poly_size-1:0] crc_chk_crc_in; reg [poly_size-1:0] crc_inv_alt; reg [poly_size-1:0] crc_polynomial; `include "bit_order_crc_function.inc" `include "bit_order_data_function.inc" `include "calculate_crc_w_in_function.inc" `include "calculate_crc_function.inc" `include "calculate_crc_crc_function.inc" generate //begin genvar bit_idx; reg [63:0] crc_polynomial64; reg [15:0] coef0; reg [15:0] coef1; reg [15:0] coef2; reg [15:0] coef3; assign coef0= poly_coef0; assign coef0= poly_coef1; assign coef0= poly_coef2; assign coef0= poly_coef3; assign crc_polynomial64 = {coef3, coef2, coef1, coef0}; assign crc_pollynomial = crc_polynomial64[poly_size-1:0]; case(crc_cfg/2) 0: assign crc_inv_alt = {poly_size{1'b0}}; 1: for(bit_idx = 0; bit_idx<poly_sizel bit_idx=bit_idx+1) assign crc_inv_alt[bit_idx] = (bit_idx % 2)? 1'b0:1'b1; 2: for(bit_idx=0; bit_idx<poly_size; bit_idx=bit_idx+1) assign crc_inv_alt[bit_idx] = (bit_idx % 2)?1'b1:1'b0; 3: assign crc_inv_alt = { poly_size{1'b1}}; endcase endgenerate assign crc_in_inv = bit_order_crc(crc_in) ^ crc_inv_alt; assign crc_reg = calculate_crc(bit_order_data(data_in)); assign crc_out_inv = crc_reg; assign crc_out = bit_order_crc(crc_out_inv)^ crc_inv_alt; assign crc_chk_crc_in = calculate_crc_crc(crc_reg, crc_in_inv); assign crc_ok = (crc_chk_crc_in ==0); `undef DW_max_data_crc_1 endmodule `pragma protect end can you write a testbench for this piece of CRC verilog code so that this verilog file and the testbench can be used togerther by vcs to verify the correctness of this verilog file?
Sure, here's a basic testbench for the `DW_crc_p` module:
```
`timescale 1ns/1ps
module testbench;
// Inputs
reg [15:0] data_in;
reg [15:0] crc_in;
// Outputs
wire crc_ok;
wire [15:0] crc_out;
// Instantiate the DUT
DW_crc_p dut (
.data_in(data_in),
.crc_in(crc_in),
.crc_ok(crc_ok),
.crc_out(crc_out)
);
initial begin
// Initialize inputs
data_in = 16'h1234;
crc_in = 16'h5678;
// Wait for a few cycles
#10;
// Change inputs
data_in = 16'h5678;
crc_in = 16'h1234;
// Wait for a few cycles
#10;
// Add more test cases as needed
// Check outputs
$display("crc_ok = %b, crc_out = %h", crc_ok, crc_out);
end
endmodule
```
This testbench simply initializes the `data_in` and `crc_in` inputs, waits for a few cycles, changes the inputs, waits for a few more cycles, and then checks the `crc_ok` and `crc_out` outputs using the `$display` system task. You can add more test cases as needed by changing the input values and checking the output values. To run the testbench with the `DW_crc_p` module, you can use the following command:
```
vcs -debug testbench.v DW_crc_p.v
```
This will compile both the testbench and the `DW_crc_p` module, and then run the simulation. You can view the simulation results using the `dve` GUI or by examining the output in the terminal window.