verilog中实现8点fft
时间: 2023-10-10 08:11:37 浏览: 70
以下是一个简单的 Verilog 代码实现 8 点 FFT:
```
module fft_8(input clk, input reset, input [7:0] x_real, input [7:0] x_imag, output reg [7:0] y_real, output reg [7:0] y_imag);
// 定义旋转因子
parameter [7:0] w_8_0_real = 8'h7F;
parameter [7:0] w_8_0_imag = 8'h00;
parameter [7:0] w_8_1_real = 8'h5A;
parameter [7:0] w_8_1_imag = 8'h5A;
parameter [7:0] w_8_2_real = 8'h00;
parameter [7:0] w_8_2_imag = 8'h7F;
parameter [7:0] w_8_3_real = 8'hA5;
parameter [7:0] w_8_3_imag = 8'h5A;
reg [7:0] a0_real, a0_imag, a1_real, a1_imag, a2_real, a2_imag, a3_real, a3_imag, a4_real, a4_imag, a5_real, a5_imag, a6_real, a6_imag, a7_real, a7_imag;
reg [7:0] b0_real, b0_imag, b1_real, b1_imag, b2_real, b2_imag, b3_real, b3_imag, b4_real, b4_imag, b5_real, b5_imag, b6_real, b6_imag, b7_real, b7_imag;
// 第一级蝴蝶运算
b0_real = x_real;
b0_imag = x_imag;
b1_real = x_real;
b1_imag = x_imag;
b2_real = x_real;
b2_imag = x_imag;
b3_real = x_real;
b3_imag = x_imag;
a0_real = b0_real + b4_real;
a0_imag = b0_imag + b4_imag;
a1_real = b1_real + b5_real;
a1_imag = b1_imag + b5_imag;
a2_real = b2_real + b6_real;
a2_imag = b2_imag + b6_imag;
a3_real = b3_real + b7_real;
a3_imag = b3_imag + b7_imag;
a4_real = b0_real - b4_real;
a4_imag = b0_imag - b4_imag;
a5_real = b1_real - b5_real;
a5_imag = b1_imag - b5_imag;
a6_real = b2_real - b6_real;
a6_imag = b2_imag - b6_imag;
a7_real = b3_real - b7_real;
a7_imag = b3_imag - b7_imag;
// 第二级蝴蝶运算
b0_real = a0_real + a2_real;
b0_imag = a0_imag + a2_imag;
b1_real = a1_real + a3_real;
b1_imag = a1_imag + a3_imag;
b2_real = a0_real - a2_real;
b2_imag = a0_imag - a2_imag;
b3_real = a1_real - a3_real;
b3_imag = a1_imag - a3_imag;
b4_real = a4_real + a6_real;
b4_imag = a4_imag + a6_imag;
b5_real = a5_real + a7_real;
b5_imag = a5_imag + a7_imag;
b6_real = a4_real - a6_real;
b6_imag = a4_imag - a6_imag;
b7_real = a5_real - a7_real;
b7_imag = a5_imag - a7_imag;
// 第三级蝴蝶运算
a0_real = b0_real + b1_real;
a0_imag = b0_imag + b1_imag;
a1_real = b2_real + b3_imag;
a1_imag = b2_imag - b3_real;
a2_real = b0_real - b1_real;
a2_imag = b0_imag - b1_imag;
a3_real = b2_real - b3_imag;
a3_imag = b2_imag + b3_real;
a4_real = b4_real + b5_real;
a4_imag = b4_imag + b5_imag;
a5_real = b6_real + b7_imag;
a5_imag = b6_imag - b7_real;
a6_real = b4_real - b5_real;
a6_imag = b4_imag - b5_imag;
a7_real = b6_real - b7_imag;
a7_imag = b6_imag + b7_real;
// 第四级蝴蝶运算
y_real = a0_real + a4_real;
y_imag = a0_imag + a4_imag;
y_real = a1_real + a5_real;
y_imag = a1_imag + a5_imag;
y_real = a2_real + a6_real;
y_imag = a2_imag + a6_imag;
y_real = a3_real + a7_real;
y_imag = a3_imag + a7_imag;
endmodule
```
这个代码实现了一个 8 点 FFT,输入为实部和虚部,输出为实部和虚部,时钟和重置信号作为输入。在代码中定义了旋转因子,然后使用四级蝴蝶运算计算 FFT。