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lab-04: signed mult working

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This commit is contained in:
Yuri Tatishchev 2024-10-08 16:00:01 -07:00
parent 73aa647c9b
commit cdfaa51626
Signed by: CaZzzer
GPG Key ID: 28BE602058C08557
1 changed files with 20 additions and 14 deletions
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34
mult.v
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@ -27,7 +27,25 @@ output [31:0] LO;
input [31:0] A;
input [31:0] B;
// TBD
wire [31:0] A_neg, B_neg;
TWOSCOMP32 A_twoscomp(A_neg, A);
TWOSCOMP32 B_twoscomp(B_neg, B);
wire [31:0] A_abs, B_abs;
MUX32_2x1 A_mux(A_abs, A, A_neg, A[31]);
MUX32_2x1 B_mux(B_abs, B, B_neg, B[31]);
wire [31:0] HI_abs, LO_abs;
MULT32_U mult_abs(HI_abs, LO_abs, A_abs, B_abs);
wire [31:0] HI_neg, LO_neg;
TWOSCOMP64 mult_neg({HI_neg,LO_neg}, {HI_abs,LO_abs});
wire sign;
xor (sign, A[31], B[31]);
MUX32_2x1 HI_mux(HI, HI_abs, HI_neg, sign);
MUX32_2x1 LO_mux(LO, LO_abs, LO_neg, sign);
endmodule
@ -69,19 +87,7 @@ generate
end
endgenerate
// last partial is HI
// multiply A by a most significant digit in B
//wire [31:0] A_and;
//AND32_2x1 partial32_and(A_and, A, {32{B[31]}});
// calc HI
//RC_ADD_SUB_32 partial32_add(.Y(HI), .A(A_and), .B({CI[30],Y[30][31:1]}), .SnA(1'b0));
// put lowest bit from calc into result
//buf (LO[31], HI[0]);
// last partial is HI
// last carry and partial is HI
BUF32_1x1 buf_hi(HI, {CI[31],Y[31][31:1]});
endmodule