Basic Datapath

MemData

Read

address

Memory

Write

address

Write

data

Read

register1

Read

register2

Write

register

Write

data

Registers

Read

data 1

Read

data 2

Zero

ALU

result

Instruction

register

Ins [25-21]

Ins [20-16]

Ins [15-0]

PC

M

u

x

0

1

M

u

x

0

1

M

u

x

0

1

M

u

x

0

1

Sign

extend

Shift

left2

2

M

u

x

0

3

1

2

4

ALU

Control

MemtoReg

ALUOp

ALUSelB

IorD

MemRead

MemWrite

IRWrite

RegDst

RegWrite

ALUSelA

Memory

data

register

B

A

A

L

U

O

u

t

PCWrite

M

u

x

2

1

PCSource

0

Shift

left2

Add registers: IR, MDR, A, B, ALUOut

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