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Chapter 2: Custom single-purpose processors - page 6 / 29

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6

Embedded Systems Design: A Unified Hardware/Software Introduction, (c) 2000 Vahid/Givargis

Basic logic gates

F = x y

AND

F = (x y)’

NAND

F = x y

XOR

F = x

Driver

F = x’

Inverter

x

F

F = x + y

OR

F = (x+y)’

NOR

x

F

x

y

F

F

x

y

x

y

F

x

y

F

x

y

F

F = x    y

XNOR

F

y

x

x

0

y

0

F

0

0

1

0

1

0

0

1

1

1

x

0

y

0

F

0

0

1

1

1

0

1

1

1

1

x

0

y

0

F

0

0

1

1

1

0

1

1

1

0

x

0

y

0

F

1

0

1

0

1

0

0

1

1

1

x

0

y

0

F

1

0

1

1

1

0

1

1

1

0

x

0

y

0

F

1

0

1

0

1

0

0

1

1

0

x

F

0

0

1

1

x

F

0

1

1

0

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