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HDU.v
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`timescale 1ns / 1ps
//Hazard Detection Unit
`define ADD 6'b000000
`define SUB 6'b000000
`define AND 6'b000000
`define JR 6'b000000
`define ORI 6'b001101
`define ADDI 6'b001000
`define BEQ 6'b000100
`define J 6'b000010
`define JAL 6'b000011
`define SW 6'b101011
`define LW 6'b100011
`define LUI 001111
`define ALU 2'b01
`define DM 2'b10
`define PC 2'b11
`define NW 2'b00
module HDU(opD,A1D,A2D,A1E,A2E,A3E,A3M,A3W,Stall,FCMP1D,FCMP2D,FALUAE,FALUBE,res0,res_E,res_M,res_W);
input[5:0] opD;
input[4:0] A1D,A2D,A1E,A2E,A3E,A3M,A3W;
input[1:0] res0,res_E,res_M,res_W;
//input clk;
output Stall;
output[1:0] FCMP1D,FCMP2D,FALUAE,FALUBE;
reg add=0,sub=0,And=0,ori=0,addi=0,beq=0,j=0,sw=0,lw=0,lui=0,jr=0,jal=0;
reg Tuse_rs0=0,Tuse_rs1=0,Tuse_rt0=0,Tuse_rt1=0,Tuse_rt2=0;
reg Stall_rs0_E1=0,Stall_rs0_E2=0,/*Stall_rs0_E3,*/Stall_rs0_M1=0,Stall_rs1_E2=0,Stall_rs=0;
reg Stall_rt0_E1=0,Stall_rt0_E2=0,/*Stall_rt0_E3,*/Stall_rt0_M1=0,Stall_rt1_E2=0,Stall_rt=0;
reg Stall=0;
reg[1:0] FCMP1D=0,FCMP2D=0,FALUAE=0,FALUBE=0;
always @ (opD,A1D,A2D,A1E,A2E,A3E,A3M,A3W,res0,res_E,res_M,res_W)
begin
case(opD)
`ADD:
begin
add<=1;
sub<=0;
ori<=0;
addi<=0;
beq<=0;
j<=0;
lw<=0;
sw<=0;
lui<=0;
And<=0;
jr<=0;
jal<=0;
end
`SUB:
begin
add<=0;
sub<=1;
ori<=0;
addi<=0;
beq<=0;
j<=0;
lw<=0;
sw<=0;
lui<=0;
And<=0;
jr<=0;
jal<=0;
end
`ORI:
begin
add<=0;
sub<=0;
ori<=1;
addi<=0;
beq<=0;
j<=0;
lw<=0;
sw<=0;
lui<=0;
And<=0;
jr<=0;
jal<=0;
end
`ADDI:
begin
add<=0;
sub<=0;
ori<=0;
addi<=1;
beq<=0;
j<=0;
lw<=0;
sw<=0;
lui<=0;
And<=0;
jr<=0;
jal<=0;
end
`BEQ:
begin
add<=0;
sub<=0;
ori<=0;
addi<=0;
beq<=1;
j<=0;
lw<=0;
sw<=0;
lui<=0;
And<=0;
jr<=0;
jal<=0;
end
`J:
begin
add<=0;
sub<=0;
ori<=0;
addi<=0;
beq<=0;
j<=1;
lw<=0;
sw<=0;
lui<=0;
And<=0;
jr<=0;
jal<=0;
end
`LW:
begin
add<=0;
sub<=0;
ori<=0;
addi<=0;
beq<=0;
j<=0;
lw<=1;
sw<=0;
lui<=0;
And<=0;
jr<=0;
jal<=0;
end
`SW:
begin
add<=0;
sub<=0;
ori<=0;
addi<=0;
beq<=0;
j<=0;
lw<=0;
sw<=1;
lui<=0;
And<=0;
jr<=0;
jal<=0;
end
`LUI:
begin
add<=0;
sub<=0;
ori<=0;
addi<=0;
beq<=0;
j<=0;
lw<=0;
sw<=0;
lui<=1;
And<=0;
jr<=0;
jal<=0;
end
`AND:
begin
add<=0;
sub<=0;
ori<=0;
addi<=0;
beq<=0;
j<=0;
lw<=0;
sw<=0;
lui<=0;
And<=1;
jr<=0;
jal<=0;
end
`JR:
begin
add<=0;
sub<=0;
ori<=0;
addi<=0;
beq<=0;
j<=0;
lw<=0;
sw<=0;
lui<=0;
And<=0;
jr<=1;
jal<=0;
end
`JAL:
begin
add<=0;
sub<=0;
ori<=0;
addi<=0;
beq<=0;
j<=0;
lw<=0;
sw<=0;
lui<=0;
And<=0;
jr<=0;
jal<=1;
end
endcase
/*case(opM)
`ADD:res_M<=ALU;
`SUB:res_M<=ALU;
`ORI:res_M<=ALU;
`ADDI:res_M<=ALU;
`LUI:res_M<=ALU;
`LW:res_M<=DM;
`J:res_M<=PC;
default:res_M<=NW;
endcase
case(opW)
`ADD:res_W<=ALU;
`SUB:res_W<=ALU;
`ORI:res_W<=ALU;
`ADDI:res_W<=ALU;
`LUI:res_W<=ALU;
`LW:res_W<=DM;
`J:res_W<=PC;
default:res_W<=NW;
endcase*/
Tuse_rs0=beq|jr;
Tuse_rs1=add|sub|ori|addi|lw|sw|And;
Tuse_rt0=beq;
Tuse_rt1=add|sub|And;
Tuse_rt2=sw;
Stall_rs0_E1=Tuse_rs0&(res_E==2'b01)&(A1D==A3E)&(A1D!=0);
Stall_rs0_E2=Tuse_rs0&(res_E==2'b10)&(A1D==A3E)&(A1D!=0);
//Stall_rs0_E3=Tuse_rs0&(res0==2'b01)&(A1D==A3E)&(A1D!=0);
Stall_rs0_M1=Tuse_rs0&(res_M==2'b10)&(A1D==A3M)&(A1D!=0);
Stall_rs1_E2=Tuse_rs1&(res_E==2'b10)&(A1D==A3E)&(A1D!=0);
Stall_rs=Stall_rs0_E1|Stall_rs0_E2|Stall_rs0_M1|Stall_rs1_E2;//|Stall_rs0_E3;
Stall_rt0_E1=Tuse_rt0&(res_E==2'b01)&(A2D==A3E)&(A2D!=0);
Stall_rt0_E2=Tuse_rt0&(res_E==2'b10)&(A2D==A3E)&(A2D!=0);
//Stall_rt0_E3=Tuse_rt0&(res0==2'b01)&(A1D==A3E)&(A1D!=0);
Stall_rt0_M1=Tuse_rt0&(res_M==2'b10)&(A2D==A3M)&(A2D!=0);
Stall_rt1_E2=Tuse_rt1&(res_E==2'b10)&(A2D==A3E)&(A2D!=0);
Stall_rt=Stall_rt0_E1|Stall_rt0_E2|Stall_rt0_M1|Stall_rt1_E2;//|Stall_rt0_E3;
Stall=Stall_rs|Stall_rt;
//FCMP1D=((A1==A3M)&(res_M==`ALU))?2'b11:(((A1==A3W)&(res_W==`ALU))?2'b10:(((A1==A3W)&(res_W==`DM))?2'b01:0));
//FCMP2D=((A2==A3M)&(res_M==`ALU))?2'b11:(((A2==A3W)&(res_W==`ALU))?2'b10:(((A2==A3W)&(res_W==`DM))?2'b01:0));
//FALUAE=((A1E==A3M)&(res_M==`ALU))?2'b11:(((A1E==A3W)&(res_W==`ALU))?2'b10:(((A1E==A3W)&(res_W==`DM))?2'b01:0));
//FALUBE=((A2E==A3M)&(res_M==`ALU))?2'b11:(((A2E==A3W)&(res_W==`ALU))?2'b10:(((A2E==A3W)&(res_W==`DM))?2'b01:0));
FCMP1D=((A1D==A3M)&(res_M==`ALU)&(A1D!=0)&(A3M!=0))?2'b11:((A1D==A3W)&(res_W==`ALU)&(A1D!=0)&(A3W!=0))?2'b10:((A1D==A3W)&(res_W==`DM)&(A1D!=0)&(A3W!=0))?2'b01:0;
FCMP2D=((A2D==A3M)&(res_M==`ALU)&(A1D!=0)&(A3M!=0))?2'b11:((A2D==A3W)&(res_W==`ALU)&(A1D!=0)&(A3W!=0))?2'b10:((A2D==A3W)&(res_W==`DM)&(A1D!=0)&(A3W!=0))?2'b01:0;
FALUAE=((A1E==A3M)&(res_M==`ALU)&(A1E!=0)&(A3M!=0))?2'b11:((A1E==A3W)&(res_W==`ALU)&(A1E!=0)&(A3W!=0))?2'b10:((A1E==A3W)&(res_W==`DM)&(A1E!=0)&(A3W!=0))?2'b01:0;
FALUBE=((A2E==A3M)&(res_M==`ALU)&(A2E!=0)&(A3M!=0))?2'b11:
((A2E==A3W)&(res_W==`ALU)&(A2E!=0)&(A3W!=0))?2'b10:
((A2E==A3W)&(res_W==`DM)&(A2E!=0)&(A3W!=0))?2'b01:
0;
end
endmodule