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Module fft 128 ppt
1.
module fft(clk,sel,yr,yi); //main
module input clk; input [2:0]sel; output reg [7:0]yr,yi; wire [7:0]y0r,y1r,y2r,y3r,y4r,y5r,y6r,y7r,y0i,y1i,y2i,y3i,y4i,y5i,y6i,y7i; wire [7:0]x20r,x20i,x21r,x21i,x22r,x22i,x23r,x23i,x24r,x24i,x25r,x25i,x26r,x26i,x27r,x27i; wire [7:0]x10r,x10i,x11r,x11i,x12r,x12i,x13r,x13i,x14r,x14i,x15r,x15i,x16r,x16i,x17r,x17i; wire [7:0]x0,x1,x2,x3,x4,x5,x6,x7; parameter w0r=8'b1; parameter w0i=8'b0; parameter w1r=8'b10110101; parameter w1i=8'b01001011; parameter w2r=8'b0; parameter w2i=8'b11111111; parameter w3r=8'b01001011; parameter w3i=8'b01001011; assign x0=8'b1; assign x1=8'b10; assign x2=8'b100; assign x3=8'b1000; assign x4=8'b10000; assign x5=8'b100000; assign x6=8'b1000000; assign x7=8'b10000000; //stage1 bfly1 s11(x0,x4,w0r,w0i,x10r,x10i,x11r,x11i); bfly1 s12(x2,x6,w0r,w0i,x12r,x12i,x13r,x13i); bfly1 s13(x1,x5,w0r,w0i,x14r,x14i,x15r,x15i); bfly1 s14(x3,x7,w0r,w0i,x16r,x16i,x17r,x17i); //stage2 bfly1 s21(x10r,x12r,w0r,w0i,x20r,x20i,x22r,x22i); bfly2 s22(x11r,x11i,x13r,x13i,x21r,x21i,x23r,x23i); bfly1 s23(x14r,x16r,w0r,w0i,x24r,x24i,x26r,x26i); bfly2 s24(x15r,x15i,x17r,x17i,x25r,x25i,x27r,x27i); //stage3 bfly1 s31(x20r,x24r,w0r,w0i,y0r,y0i,y4r,y4i); bfly3 s32(x21r,x21i,x25r,x25i,w1r,w1i,y1r,y1i,y5r,y5i); bfly2 s33(x22r,x22i,x26r,x26i,y2r,y2i,y6r,y6i); bfly4 s34(x23r,x23i,x27r,x27i,w3r,w3i,y3r,y3i,y7r,y7i); always@(posedge clk)
2.
case(sel) 0:begin yr=y0r; yi=y0i;
end 1:begin yr=y1r; yi=y1i; end 2:begin yr=y2r; yi=y2i; end 3:begin yr=y3r; yi=y3i; end 4:begin yr=y4r; yi=y4i; end 5:begin yr=y5r; yi=y5i; end 6:begin yr=y6r; yi=y6i; end 7:begin yr=y7r; yi=y7i; end endcase endmodule module bfly1(x,y,wr,wi,x0r,x0i,x1r,x1i);// sub module input [7:0]x,y,wr,wi; output[7:0]x1r,x1i,x0r,x0i; assign x0r=x+(y*wr); assign x0i=y*wi; assign x1r=x+(~(y*wr)+1); assign x1i=~(y*wi)+1; endmodule module bfly2(xr,xi,yr,yi,x0r,x0i,x1r,x1i); // sub module input [7:0]xr,xi,yr,yi; output [7:0]x0r,x0i,x1r,x1i; assign x0r=xr; assign x0i=~yr+1; assign x1r=xr; assign x1i=yr; endmodule module bfly3(xr,xi,yr,yi,wr,wi,x0r,x0i,x1r,x1i); // sub module input [7:0]xr,xi,yr,yi,wr,wi; output [7:0]x0r,x0i,x1r,x1i; wire [15:0]p1,p2,p3,p4; wire [7:0]win,yrn,yin; wire [8:0]ywr,ywi; parameter sht=8'b1000; assign yrn=~yr+1; assign yin=yi; assign win=~wi+1; assign p1=(yrn*wr)>>sht; assign p2=(yin*win)>>sht; assign p3=(yrn*win)>>sht; assign p4=(yin*wr)>>sht; assign ywr=(~p1+1)+p2;
3.
assign ywi=p3+p4; assign x0r=xr+ywr; assign
x0i=xi+ywi; assign x1r=xr+(~ywr+1); assign x1i=xi+(~ywi+1); endmodule module bfly4(xr,xi,yr,yi,wr,wi,x0r,x0i,x1r,x1i); // sub module input [7:0]xr,xi,yr,yi,wr,wi; output [7:0]x0r,x0i,x1r,x1i; wire [15:0]p1,p2; wire [7:0]win,yrn,yin; wire [8:0]ywr,ywi; parameter sht=8'b1000; assign yrn=~yr+1; assign yin=~yi+1; assign win=~wi+1; assign p1=(yrn*win)>>sht; assign p2=(yin*win)>>sht; assign ywr=p1+(~p2+1); assign ywi=p1+p2; assign x0r=xr+ywr; assign x0i=xi+ywi; assign x1r=xr+(~ywr+1); assign x1i=xi+(~ywi+1); endmodule
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