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Copy pathFFT4_LUT.v
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FFT4_LUT.v
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module FFT4_LUT_Re(k, n, twiddle);
input [1:0] k;
input [1:0] n;
wire [3:0] address;
assign address = {k, n};
output reg [16:0] twiddle;
always @ (address)
begin
$display("LUT address=%d, k=%d, n=%d", address, k, n);
case(address)
4'd0: twiddle = 16'd65535; // k = 0, n = 0
4'd1: twiddle = 16'd65535; // k = 0, n = 1
4'd2: twiddle = 16'd65535; // k = 0, n = 2
4'd3: twiddle = 16'd65535; // k = 0, n = 3
4'd4: twiddle = 16'd65535; // k = 1, n = 0
4'd5: twiddle = 16'd0; // k = 1, n = 1
4'd6: twiddle = -16'd65535; // k = 1, n = 2
4'd7: twiddle = 16'd0; // k = 1, n = 3
4'd8: twiddle = 16'd65535; // k = 2, n = 0
4'd9: twiddle = -16'd65535; // k = 2, n = 1
4'd10: twiddle = 16'd65535; // k = 2, n = 2
4'd11: twiddle = -16'd65535; // k = 2, n = 3
4'd12: twiddle = 16'd65535; // k = 3, n = 0
4'd13: twiddle = 16'd0; // k = 3, n = 1
4'd14: twiddle = -16'd65535; // k = 3, n = 2
4'd15: twiddle = 16'd0; // k = 3, n = 3
endcase
end
endmodule
module FFT4_LUT_Im(k, n, twiddle);
input [1:0] k;
input [1:0] n;
wire [3:0] address;
assign address = {k, n};
output reg [16:0] twiddle;
always @ (address)
begin
case(address)
4'd0: twiddle = 16'd0; // k = 0, n = 0
4'd1: twiddle = 16'd0; // k = 0, n = 1
4'd2: twiddle = 16'd0; // k = 0, n = 2
4'd3: twiddle = 16'd0; // k = 0, n = 3
4'd4: twiddle = 16'd0; // k = 1, n = 0
4'd5: twiddle = 16'd65535; // k = 1, n = 1
4'd6: twiddle = 16'd0; // k = 1, n = 2
4'd7: twiddle = -16'd65535; // k = 1, n = 3
4'd8: twiddle = 16'd0; // k = 2, n = 0
4'd9: twiddle = 16'd0; // k = 2, n = 1
4'd10: twiddle = 16'd0; // k = 2, n = 2
4'd11: twiddle = 16'd0; // k = 2, n = 3
4'd12: twiddle = 16'd0; // k = 3, n = 0
4'd13: twiddle = -16'd65535; // k = 3, n = 1
4'd14: twiddle = 16'd0; // k = 3, n = 2
4'd15: twiddle = 16'd65535; // k = 3, n = 3
endcase
end
endmodule