基于Verilog的FFT模块实现
Posted fpga&matlab
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了基于Verilog的FFT模块实现相关的知识,希望对你有一定的参考价值。
/*
-- Arish Alreja: ECE 4902 Special Problems Spring 2006
-- School of Electrical & Computer Engineering
-- Georgia Institute of Technology
-- Atlanta, GA 30332
--
-- 64 point FFT Processor
--
-- Top level FFT module */
module fft (
clk,
en_fft,
done_fft,
memwrite_en,
mem_rd_addr0,
mem_rd_addr1,
mem_rd_addr2,
mem_rd_addr3,
mem_rd_addr4,
mem_rd_addr5,
mem_rd_addr6,
mem_rd_addr7,
mem_wr_addr0,
mem_wr_addr1,
mem_wr_addr2,
mem_wr_addr3,
mem_wr_addr4,
mem_wr_addr5,
mem_wr_addr6,
mem_wr_addr7,
rd_data0,
rd_data1,
rd_data2,
rd_data3,
rd_data4,
rd_data5,
rd_data6,
rd_data7,
wr_data0,
wr_data1,
wr_data2,
wr_data3,
wr_data4,
wr_data5,
wr_data6,
wr_data7
);
// Clock and initialization signal
input clk;
input en_fft;
// Read Address buses
output [02:00] mem_rd_addr0;
output [02:00] mem_rd_addr1;
output [02:00] mem_rd_addr2;
output [02:00] mem_rd_addr3;
output [02:00] mem_rd_addr4;
output [02:00] mem_rd_addr5;
output [02:00] mem_rd_addr6;
output [02:00] mem_rd_addr7;
// Write Address buses
output [02:00] mem_wr_addr0;
output [02:00] mem_wr_addr1;
output [02:00] mem_wr_addr2;
output [02:00] mem_wr_addr3;
output [02:00] mem_wr_addr4;
output [02:00] mem_wr_addr5;
output [02:00] mem_wr_addr6;
output [02:00] mem_wr_addr7;
// Read Data buses
input [31:00] rd_data0;
input [31:00] rd_data1;
input [31:00] rd_data2;
input [31:00] rd_data3;
input [31:00] rd_data4;
input [31:00] rd_data5;
input [31:00] rd_data6;
input [31:00] rd_data7;
// Write Data buses
output [31:00] wr_data0;
output [31:00] wr_data1;
output [31:00] wr_data2;
output [31:00] wr_data3;
output [31:00] wr_data4;
output [31:00] wr_data5;
output [31:00] wr_data6;
output [31:00] wr_data7;
// Signal to enable Write to memory
output memwrite_en;
// Signal to indicate completion of FFT
output done_fft;
// REGISTER BANKS TO PROVIDE INPUT TO AND RECEIVE OUTPUT FROM THE BUTTERFLY PROC.
reg [31:0] regbankone[7:0];
reg [31:0] regbanktwo[7:0];
// control signal wire coming out of the microcoded state machine
wire [14:0] controlsignal;
// Signals to go into and come out of the butterfly processor
reg [31:00] bfp_in_a;
reg [31:00] bfp_in_b;
wire [31:00] bfp_out_a;
wire [31:00] bfp_out_b;
// delayed output of the butterfly processor
reg [31:0] d_bfp_out_a;
reg [31:0] d_bfp_out_b;
reg [31:0] dd_bfp_out_a;
reg [31:0] dd_bfp_out_b;
// Instantiation of the butterfly processor
butterfly butterfly (
.clk (clk),
.reset (en_fft),
.read_data_a (bfp_in_a),
.read_data_b (bfp_in_b),
.write_data_a (bfp_out_a),
.write_data_b (bfp_out_b),
.bfpcontrol (controlsignal[4:0])
);
// Registers to hold the signals coming out of the control module
// along with their delayed versions
wire [2:0] RS1;
wire [2:0] RS2;
reg [2:0] D_RS1;
reg [2:0] D_RS2;
reg [2:0] DD_RS1;
reg [2:0] DD_RS2;
reg [2:0] DDD_RS1;
reg [2:0] DDD_RS2;
reg [2:0] DDDD_RS1;
reg [2:0] DDDD_RS2;
reg D_input_reg_sel;
reg DD_input_reg_sel;
reg DDD_input_reg_sel;
reg DDDD_input_reg_sel;
reg D_dest_bank_sel;
reg DD_dest_bank_sel;
reg DDD_dest_bank_sel;
reg DDDD_dest_bank_sel;
wire dest_bank_sel;
wire readmem_en;
wire input_reg_sel;
assign memwrite_en = controlsignal[14];
assign readmem_en = controlsignal[13];
assign RS1[2:0] = controlsignal[12:10];
assign RS2[2:0] = controlsignal[9:7];
assign input_reg_sel = controlsignal[6];
assign dest_bank_sel = controlsignal[5];
// Instantiation of the MICROCODED STATE MACHINE control module
control control(
.clk (clk),
.en_fft (en_fft),
.done_fft (done_fft),
.controlsignal (controlsignal)
);
// Instantiation of the Address Generation Unit
agu agu(
.clk (clk),
.en_fft (en_fft),
.readmem_en (readmem_en),
.memwrite_en (memwrite_en),
.agu_rd_addr0 (mem_rd_addr0),
.agu_rd_addr1 (mem_rd_addr1),
.agu_rd_addr2 (mem_rd_addr2),
.agu_rd_addr3 (mem_rd_addr3),
.agu_rd_addr4 (mem_rd_addr4),
.agu_rd_addr5 (mem_rd_addr5),
.agu_rd_addr6 (mem_rd_addr6),
.agu_rd_addr7 (mem_rd_addr7),
.agu_wr_addr0 (mem_wr_addr0),
.agu_wr_addr1 (mem_wr_addr1),
.agu_wr_addr2 (mem_wr_addr2),
.agu_wr_addr3 (mem_wr_addr3),
.agu_wr_addr4 (mem_wr_addr4),
.agu_wr_addr5 (mem_wr_addr5),
.agu_wr_addr6 (mem_wr_addr6),
.agu_wr_addr7 (mem_wr_addr7)
);
// Multiplexer for selecting the butterfly input 'a' from reg bank 1
reg [31:0]bfpr1_a;
always @(RS1 or regbankone[0] or regbankone[1] or regbankone[2] or regbankone[3]
or regbankone[4] or regbankone[5] or regbankone[6] or regbankone[7])
begin
if (RS1 == 0) begin
bfpr1_a = regbankone[0];end
if (RS1 == 1) begin
bfpr1_a = regbankone[1]; end
if (RS1 == 2) begin
bfpr1_a= regbankone[2]; end
if (RS1 == 3) begin
bfpr1_a = regbankone[3]; end
if (RS1 == 4) begin
bfpr1_a = regbankone[4]; end
if (RS1 == 5) begin
bfpr1_a = regbankone[5]; end
if (RS1 == 6) begin
bfpr1_a = regbankone[6]; end
if (RS1 == 7) begin
bfpr1_a = regbankone[7]; end
end
// Multiplexer for selecting the butterfly input 'b' from reg bank 1
reg [31:0]bfpr1_b;
always @(RS2 or regbankone[0] or regbankone[1] or regbankone[2] or regbankone[3]
or regbankone[4] or regbankone[5] or regbankone[6] or regbankone[7])
begin
if (RS2 == 0) begin
bfpr1_b = regbankone[0]; end
if (RS2 == 1) begin
bfpr1_b = regbankone[1]; end
if (RS2 == 2) begin
bfpr1_b = regbankone[2]; end
if (RS2 == 3) begin
bfpr1_b = regbankone[3]; end
if (RS2 == 4) begin
bfpr1_b = regbankone[4]; end
if (RS2 == 5) begin
bfpr1_b = regbankone[5]; end
if (RS2 == 6) begin
bfpr1_b = regbankone[6]; end
if (RS2 == 7) begin
bfpr1_b = regbankone[7]; end
end
// Multiplexer for selecting the butterfly input 'a' from reg bank 2
reg [31:0]bfpr2_a;
always @(RS1 or regbanktwo[0] or regbanktwo[1] or regbanktwo[2] or regbanktwo[3]
or regbanktwo[4] or regbanktwo[5] or regbanktwo[6] or regbanktwo[7])
begin
if (RS1 == 0) begin
bfpr2_a = regbanktwo[0]; end
if (RS1 == 1) begin
bfpr2_a = regbanktwo[1]; end
if (RS1 == 2) begin
bfpr2_a = regbanktwo[2]; end
if (RS1 == 3) begin
bfpr2_a = regbanktwo[3]; end
if (RS1 == 4) begin
bfpr2_a = regbanktwo[4]; end
if (RS1 == 5) begin
bfpr2_a = regbanktwo[5]; end
if (RS1 == 6) begin
bfpr2_a = regbanktwo[6]; end
if (RS1 == 7) begin
bfpr2_a = regbanktwo[7]; end
end
// Multiplexer for selecting the butterfly input 'b' from reg bank 2
reg [31:0]bfpr2_b;
always @(RS2 or regbanktwo[0] or regbanktwo[1] or regbanktwo[2] or regbanktwo[3]
or regbanktwo[4] or regbanktwo[5] or regbanktwo[6] or regbanktwo[7])
begin
if (RS2 == 0) begin
bfpr2_b = regbanktwo[0]; end
if (RS2 == 1) begin
bfpr2_b = regbanktwo[1]; end
if (RS2 == 2) begin
bfpr2_b = regbanktwo[2]; end
if (RS2 == 3) begin
bfpr2_b = regbanktwo[3]; end
if (RS2 == 4) begin
bfpr2_b = regbanktwo[4]; end
if (RS2 == 5) begin
bfpr2_b = regbanktwo[5]; end
if (RS2 == 6) begin
bfpr2_b = regbanktwo[6]; end
if (RS2 == 7) begin
bfpr2_b = regbanktwo[7]; end
end
// Multiplexer to select the input a (from regbank 1 or 2)
always @(input_reg_sel or bfpr1_a or bfpr2_a)
begin
bfp_in_a = (input_reg_sel == 1) ? bfpr2_a : bfpr1_a;
end
// Multiplexer to select the input b (from regbank 1 or 2)
always @(input_reg_sel or bfpr1_b or bfpr2_b)
begin
bfp_in_b = (input_reg_sel == 1) ? bfpr2_b : bfpr1_b;
end
reg dest_bank; // signal to choose the target register bank.
// Multiplexer to choose the Destination Register Bank for the output
// of the Butterfly Processor
always @(DDDD_input_reg_sel or DDDD_dest_bank_sel)
begin
dest_bank =(DDDD_dest_bank_sel)? ~DDDD_input_reg_sel : DDDD_input_reg_sel;
end
// Demultiplexer to choose the destination register bank for butterfly
// outputs 'a' and 'b'.
always @(readmem_en or dd_bfp_out_a or dd_bfp_out_b or dest_bank)
begin
if (readmem_en == 0) begin
if (dest_bank == 0 )begin
regbankone[DDDD_RS1] = dd_bfp_out_a;
regbankone[DDDD_RS2] = dd_bfp_out_b; end
if (dest_bank ==1) begin
regbanktwo[DDDD_RS1] = dd_bfp_out_a;
regbanktwo[DDDD_RS2] = dd_bfp_out_b; end
end
end
// Write data buses are asynchronous
assign wr_data0 = regbanktwo[0];
assign wr_data1 = regbanktwo[1];
assign wr_data2 = regbanktwo[2];
assign wr_data3 = regbanktwo[3];
assign wr_data4 = regbanktwo[4];
assign wr_data5 = regbanktwo[5];
assign wr_data6 = regbanktwo[6];
assign wr_data7 = regbanktwo[7];
// ALWAYS STATEMENT FOR DEFAULT INITIALIZATION OF DELAYED SIGNALS
// AND TO DELAY ALL THE NECESSARY SIGNALS
always @(posedge clk)
begin
if (en_fft==1)
begin
// reset all the signals here
DDDD_RS1<=0;
DDD_RS1<=0;
DD_RS1 <=0;
D_RS1 <=0;
DDDD_RS2<=0;
DDD_RS2<=0;
DD_RS2 <=0;
D_RS2 <=0;
DDDD_input_reg_sel<=0;
DDD_input_reg_sel<=0;
DD_input_reg_sel <=0;
D_input_reg_sel <=0;
DDDD_dest_bank_sel<=0;
DDD_dest_bank_sel<=0;
DD_dest_bank_sel <=0;
D_dest_bank_sel <=0;
end
// DELAY ALL THE SIGNALS HERE //
DDDD_RS1<=DDD_RS1;
DDD_RS1<=DD_RS1;
DD_RS1 <=D_RS1;
D_RS1 <=RS1;
DDDD_RS2<=DDD_RS2;
DDD_RS2<=DD_RS2;
DD_RS2 <=D_RS2;
D_RS2 <=RS2;
dd_bfp_out_a <= d_bfp_out_a;
dd_bfp_out_b <= d_bfp_out_b;
d_bfp_out_a <= bfp_out_a;
d_bfp_out_b <= bfp_out_b;
DDDD_input_reg_sel<= DDD_input_reg_sel;
DDD_input_reg_sel<= DD_input_reg_sel;
DD_input_reg_sel <= D_input_reg_sel;
D_input_reg_sel <= input_reg_sel;
DDDD_dest_bank_sel<=DDD_dest_bank_sel;
DDD_dest_bank_sel<=DD_dest_bank_sel;
DD_dest_bank_sel <=D_dest_bank_sel;
D_dest_bank_sel <=dest_bank_sel;
// Write read data bus onto regbank 1 when reading from memory
if (readmem_en == 1)
begin
regbankone[0] = rd_data0;
regbankone[1] = rd_data1;
regbankone[2] = rd_data2;
regbankone[3] = rd_data3;
regbankone[4] = rd_data4;
regbankone[5] = rd_data5;
regbankone[6] = rd_data6;
regbankone[7] = rd_data7;
end
end
endmodule
D158
以上是关于基于Verilog的FFT模块实现的主要内容,如果未能解决你的问题,请参考以下文章
FPGA教程案例36通信案例6——基于vivado核的FFT傅里叶变换开发以及verilog输入时序配置详解,通过matlab进行辅助验证