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Added ALUZero Output + corrected other syntax errors

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Ibrahim 2020-12-02 13:12:48 +00:00
parent 89abb5c1ed
commit c4cae70ffc
1 changed files with 142 additions and 130 deletions
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266
rtl/mips_cpu_alu.v
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@ -13,7 +13,7 @@ module mips_cpu_alu(
reg [31:0] SignExtend, ZeroExtend;
input logic[10:6] shamt = instr_readdata[10:6];
input logic[10:6] shamt = instr_readdata[10:6]
);
@ -73,168 +73,180 @@ module mips_cpu_alu(
/* This is how I believe our ctrl flags should be arranged */
typedef enum logic [6:0]{
typedef enum logic [6:0]{
} ALUFlags;
} ALUFlags;
always @(alu_in1, alu_in2, ALUFlags)
begin
always @(A,B, ALUFlags)
begin
SignExtend = {{16{immediate[15]}}, immediate};
ZeroExtend = {{16{1'b0}}, immediate};
SignExtend = {{16{immediate[15]}}, immediate};
ZeroExtend = {{16{1'b0}}, immediate};
case(ALUFlags)
ADD: begin
ALUOut = A + B; // is it = or <= ??
end
case(ALUFlags)
ADD: begin
ALUOut = A + B; // is it = or <= ??
end
SUB: begin
ALUOut = A - B;
end
SUB: begin
ALUOut = A - B;
end
MULT: begin
ALUOut = A * B;
end
MULT: begin
ALUOut = A * B;
end
DIV: begin
ALUOut = A / B;
end
DIV: begin
ALUOut = A / B;
end
XOR: begin
ALUOut = A^B;
end
XOR: begin
ALUOut = A^B;
end
OR: begin
ALUOut = A | B;
end
OR: begin
ALUOut = A | B;
end
SLL: begin
ALUOut = B << shamt //Shamt is instruction read data [10:6]
end
SLL: begin
ALUOut = B << shamt //Shamt is instruction read data [10:6]
end
SRL: begin
ALUOut = B >> shamt //Shamt is instruction read data [10:6]
end
SRL: begin
ALUOut = B >> shamt //Shamt is instruction read data [10:6]
end
SLLV: begin
ALUOut = B << A
end
SLLV: begin
ALUOut = B << A
end
SRLV: begin
ALUOut = B >> A
end
SRLV: begin
ALUOut = B >> A
end
AND: begin
ALUOut = A & B;
end
AND: begin
ALUOut = A & B;
end
BEQ: begin
if A = B begin
ALUOut = 0;
end
else begin
ALUOut;
end
end
BGEZ: begin
if A>=0 begin
BEQ: begin
if A = B begin
ALUOut = 0;
end
else begin
ALUOut;
end
end
end
else begin
ALUOut;
end
BGEZAL: begin
if A>=0 begin
ALUOut = 0;
end
else begin
ALUOut;
end
end
end
BGTZ: begin
if A>0 begin
ALUOut = 0;
end
else begin
AlUOut;
end
end
BGEZ: begin
if A>=0 begin
ALUOut = 0;
end
else begin
ALUOut;
end
end
BGEZAL: begin
if A>=0 begin
ALUOut = 0;
end
else begin
ALUOut;
end
end
BGTZ: begin
if A>0 begin
ALUOut = 0;
end
else begin
AlUOut;
end
end
BLEZ: begin
if A<=0 begin
ALUOut = 0;
end
else begin
AlUOut;
end
end
BLEZ: begin
if A<=0 begin
ALUOut = 0;
end
else begin
AlUOut;
end
end
BNE: begin
if A<=0 begin
ALUOut = 0;
end
else begin
AlUOut;
end
end
BNE: begin
if A<=0 begin
ALUOut = 0;
end
else begin
AlUOut;
end
end
LB: begin
ALUOut = A + SignExtend
end
LB: begin
ALUOut = A + SignExtend
end
LBU: begin
ALUOut = A + ZeroExtend
end
LBU: begin
ALUOut = A + ZeroExtend
end
LH: begin
ALUOut = A + SignExtend
end
LH: begin
ALUOut = A + SignExtend
end
LHU: begin
ALUOut = A + ZeroExtend
end
LHU: begin
ALUOut = A + ZeroExtend
end
LUI: begin
ALUOut = {immediate, {16{1'b0}}};
end
LUI: begin
ALUOut = {immediate, {16{1'b0}}};
end
SB: begin
ALUOut = A + SignExtend
end
SB: begin
ALUOut = A + SignExtend
end
SH: begin
ALUOut = A + SignExtend
end
SH: begin
ALUOut = A + SignExtend
end
SLT: begin
ALUOut = $signed(A) < $signed(B) ? 1 : 0;
end
SLT: begin
ALUOut = $signed(A) < $signed(B) ? 1 : 0;
end
SLTU: begin
ALUOut = A < B ? 1 : 0;
end
SLTU: begin
ALUOut = A < B ? 1 : 0;
end
SRA: begin
ALUOut = $signed($signed(B) >>> shamt);
end
SRA: begin
ALUOut = $signed($signed(B) >>> shamt);
end
SRAV: begin
ALUOut = $signed($signed(B) >>> A);
end
SRAV: begin
ALUOut = $signed($signed(B) >>> A);
end
SW: begin
ALUOut = A + SignExtend
end
SW: begin
ALUOut = A + SignExtend
end
end
endcase
end
always @(ALUOut) begin
if (ALUOut == 0) begin
ALUZero <= 1;
end else begin
ALUZero <= 0;
end
end
end
endmodule