yosys/docs/source/code_examples/techmap/sym_mul_map.v

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module \$mul (A, B, Y);
parameter A_SIGNED = 0;
parameter B_SIGNED = 0;
parameter A_WIDTH = 1;
parameter B_WIDTH = 1;
parameter Y_WIDTH = 1;
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input [A_WIDTH-1:0] A;
input [B_WIDTH-1:0] B;
output [Y_WIDTH-1:0] Y;
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wire _TECHMAP_FAIL_ = A_WIDTH != B_WIDTH || B_WIDTH != Y_WIDTH;
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MYMUL #( .WIDTH(Y_WIDTH) ) g ( .A(A), .B(B), .Y(Y) );
endmodule