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User 
Code
0 
1 
32’b0 
MemWrite 
MemRead 
 
 
 
 
 
 
 
 
 
 
P C
Ins truc ti on memory 
4
R egis ters
S ign ex tend
M ux
M u x
M u x
ALU
EX
M
WB
M
WB
WB
ID/EX
EX/MEM
MEM/WB
M u x 
Data m em or y 
M ux
Forwarding unit
I F /I D
Mu x
 
 
 
0
M u x
.
S hi ft l ef t 2
W r ite dat a
R ead data
A ddr es s
R ead data
Addres s W ri te regi ster 
W r i t e data
Read data 1
Readdata 2
Read regis t er 1Read regis t er 2
ALU control3216
Inst ruc ti on [15– 11]
Inst ruc ti on [20– 16]
Inst ruc ti on [20– 16]
Inst ruc ti on [25– 21]
EscreveReg
OpALU
RegDst
EscreveMem 
LeMem 
MemtoReg
=
Instrução 
overflow
IF.Flush 
Branch 
Hazard 
detection 
unit 
OrigAU 
Control