From cdfaa51626765c8560c1be107328e45d2e357508 Mon Sep 17 00:00:00 2001 From: Yuri Tatishchev Date: Tue, 8 Oct 2024 16:00:01 -0700 Subject: [PATCH] lab-04: signed mult working --- mult.v | 34 ++++++++++++++++++++-------------- 1 file changed, 20 insertions(+), 14 deletions(-) diff --git a/mult.v b/mult.v index d14f038..9e03d0f 100644 --- a/mult.v +++ b/mult.v @@ -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