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clk

0

1D Q

FSM

en

MULD Q

FSM

en

clk

MUL

D Q

FSM

en

clk

MUL

D

G

lat

Q

D

G

lat

QD Q

FSM

en

clk

MUL

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D QCombo

Logic>

D Q

clk

Combo

Logic D Q>

0

1

D Q

D Q

D Q

+

A[msb]

clk

clk

A[msb]

B[msb]

Stage A Stage B

Stage A Stage B

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a

bc

d

a

b

c

d

a

b

c

d

p(a) = 0.3 p(b) = 0.4

p(c) = 0.7 p(d) = 0.5

SA = p(ab) + p(abd) + p(abcd)

= 0.222

SA = p(ab) + p(cd) + p(abcd)

= 0.512

high SA

low SA

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