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Controller fix

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This commit is contained in:
David Harris 2021-12-18 22:08:23 -08:00
parent 67577d7c91
commit 406f129bed
1 changed files with 1 additions and 1 deletions
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wally-pipelined/src/ieu/controller.sv
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@ -173,7 +173,7 @@ module controller(
// ALU Decoding
assign sltD = (Funct3D == 3'b010);
assign sltuD = (Funct3D == 3'b011);
assign subD = (Funct3D == 3'b000 & Funct7D[5] & OpD[5]);
assign subD = (Funct3D == 3'b000 & Funct7D[5] & OpD[5]); // OpD[5] needed; ***explain why
assign sraD = (Funct3D == 3'b101 & Funct7D[5]);
assign SubArithD = ALUOpD & (subD | sraD | sltD | sltuD); // TRUE for R-type subtracts and sra, slt, sltu
assign ALUControlD = {W64D, SubArithD, ALUOpD};