33 lines
1.1 KiB
Coq
33 lines
1.1 KiB
Coq
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//----------------------------------------------------------------------
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// Butterfly: Add/Sub and Scaling
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//----------------------------------------------------------------------
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module Butterfly #(
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parameter WIDTH = 16,
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parameter RH = 0 // Round Half Up
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)(
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input signed [WIDTH-1:0] x0_re, // Input Data #0 (Real)
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input signed [WIDTH-1:0] x0_im, // Input Data #0 (Imag)
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input signed [WIDTH-1:0] x1_re, // Input Data #1 (Real)
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input signed [WIDTH-1:0] x1_im, // Input Data #1 (Imag)
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output signed [WIDTH-1:0] y0_re, // Output Data #0 (Real)
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output signed [WIDTH-1:0] y0_im, // Output Data #0 (Imag)
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output signed [WIDTH-1:0] y1_re, // Output Data #1 (Real)
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output signed [WIDTH-1:0] y1_im // Output Data #1 (Imag)
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);
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wire signed [WIDTH:0] add_re, add_im, sub_re, sub_im;
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// Add/Sub
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assign add_re = x0_re + x1_re;
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assign add_im = x0_im + x1_im;
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assign sub_re = x0_re - x1_re;
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assign sub_im = x0_im - x1_im;
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// Scaling
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assign y0_re = (add_re + RH) >>> 1;
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assign y0_im = (add_im + RH) >>> 1;
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assign y1_re = (sub_re + RH) >>> 1;
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assign y1_im = (sub_im + RH) >>> 1;
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endmodule
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