module accumulator_fir( input clk, //系统时钟,100Hz input signed [8:0] xin, //输入数据 output signed [11:0] yout //滤波输出数据 ); //产生4级触发器输出信号,相当于4级延时后的信号 reg signed [8:0] x1,x2,x3,x4; always @(posedge clk) begin x1 <= xin; x2 <= x1; x3 <= x2; x4 <= x3; end //对连续5个输入数据进行累加,完成滤波输出 assign yout =xin + x1 + x2 + x3 + x4; endmodule
时间: 2024-04-27 17:19:12 浏览: 11
这段代码是一个4阶累加器FIR滤波器的Verilog HDL代码实现。它的功能是对输入信号xin进行滤波,输出滤波后的信号yout。
具体实现中,输入信号xin被依次存储在4个寄存器x1、x2、x3、x4中,每当系统时钟clk上升沿到来时,这4个寄存器的值依次向后移动一位,xin的值存储在x1中。这样,当5个时钟周期后,xin的值就被依次存储在了这4个寄存器中,形成了一个长度为5的延迟线。
接着,对这5个延迟线上的数据进行累加,得到输出信号yout,即为滤波后的信号。
值得注意的是,这里的输入信号xin和输出信号yout都是有符号的,分别为9位和12位。这是因为累加器FIR滤波器的特性决定的,它可以实现对信号的平滑处理和降噪,但是会使得输出信号的幅值增大,因此需要更多的位数来表示。
相关问题
module accumulator(input clk, reset, input [15:0] in, output reg [15:0] out); reg [15:0] sum; wire [15:0] carry; assign carry[0] = 1'b0; genvar i; generate for (i = 1; i < 16; i = i + 1) begin : adder full_adder adder(clk, reset, in[i], sum[i-1], carry[i-1], sum[i], carry[i]); end endgenerate always @(posedge clk) begin if (reset) begin sum <= 16'h0000; out <= 16'h0000; end else begin sum <= sum + in; out <= sum; end end endmodule module full_adder(input clk, reset, input a, b, c_in, output reg s, c_out); always @(posedge clk) begin if (reset) begin s <= 1'b0; c_out <= 1'b0; end else begin s <= a ^ b ^ c_in; c_out <= (a & b) | (a & c_in) | (b & c_in); end end endmodule为以上代码编写测试激励
以下是一个可能的测试激励代码:
```
`timescale 1ns / 1ps
module accumulator_tb;
// Inputs
reg clk;
reg reset;
reg [15:0] in;
// Outputs
wire [15:0] out;
// Instantiate the Unit Under Test (UUT)
accumulator uut (
.clk(clk),
.reset(reset),
.in(in),
.out(out)
);
initial begin
// Initialize inputs
clk = 0;
reset = 1;
in = 16'h0000;
// Wait for 10 clock cycles
#10;
// Deassert reset
reset = 0;
// Test case 1: Add 1 to accumulator
in = 16'h0001;
#10;
if (out !== 16'h0001) $display("Test case 1 failed: Expected out = 16'h0001, Actual out = %h", out);
// Test case 2: Add 2 to accumulator
in = 16'h0002;
#10;
if (out !== 16'h0003) $display("Test case 2 failed: Expected out = 16'h0003, Actual out = %h", out);
// Test case 3: Add -1 to accumulator
in = 16'hFFFF;
#10;
if (out !== 16'h0002) $display("Test case 3 failed: Expected out = 16'h0002, Actual out = %h", out);
// Test case 4: Add 0 to accumulator
in = 16'h0000;
#10;
if (out !== 16'h0002) $display("Test case 4 failed: Expected out = 16'h0002, Actual out = %h", out);
$display("Testing completed successfully!");
$finish;
end
// Toggle clock every 5 ns
always #5 clk <= ~clk;
endmodule
```
这个测试激励会对累加器进行四个测试,分别是:
1. 将1加入累加器,期望输出为1
2. 将2加入累加器,期望输出为3
3. 将-1加入累加器,期望输出为2
4. 将0加入累加器,期望输出为2
测试激励会在每个测试之间等待10个时钟周期,同时会在仿真结束时输出测试结果。注意,测试中并没有对溢出情况进行测试。
struct accumulator_set
对不起,我无法回答关于"struct accumulator_set"的问题。在提供的引用内容中没有提到这个结构体。请提供更多的信息或者引用内容,以便我能够更好地回答您的问题。
#### 引用[.reference_title]
- *1* *3* [进程调度之thread_info和thread_struct](https://blog.csdn.net/shipinsky/article/details/73087101)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control_2,239^v3^insert_chatgpt"}} ] [.reference_item]
- *2* [BPF filter](https://blog.csdn.net/shaohui973/article/details/114967011)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control_2,239^v3^insert_chatgpt"}} ] [.reference_item]
[ .reference_list ]