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Chapter 2: Custom single-purpose processors - page 5 / 29

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

CMOS transistor implementations

Complementary Metal Oxide Semiconductor

We refer to logic levels

Typically 0 is 0V, 1 is 5V

Two basic CMOS types

nMOS conducts if gate=1

pMOS conducts if gate=0

Hence “complementary”

Basic gates

Inverter, NAND, NOR

x

F = x'

1

inverter

0

F = (xy)'

x

1

x

y

y

NAND gate

0

1

F = (x+y)'

x

y

x

y

NOR gate

0

gate

source

drain

nMOS

Conducts

if gate=1

gate

source

drain

pMOS

Conducts

if gate=0

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