Introduction to Computing: Computer Organization - Main Memory, Study notes of Introduction to Computing

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INTRODUCTION TO COMPUTING

CPIT 201WEEK 10LECTURE 2^ FCIT RABIGH

COMPUTER ORGANIZATION

FCIT RABIGH

If the word is 8 bits, it is referred to asIf the word is 8 bits, it is referred to asAA^ bytebyte

. The term “byte” is so common. The term “byte” is so common In computer science that sometimes aIn computer science that sometimes a 16 16--bit word is referred to as a 2

bit word is referred to as a 2-

-bytebyte

word, or a 32word, or a 32

• -bit word is referred to asbit word is referred to as

word, or a 32word, or a 32

• -bit word is referred to asbit word is referred to as

a 4a 4--byte word.

byte word.

Main memory

For example, a memory with 64kilobytes and a word size of 1 byte hasan address space that ranges from0 to 65,535 and a bit pattern of 16 bitsto define an address. So the First location address is referred to aslocation address is referred to as Address 0000000000000000 and thelast location address is referred to asaddress1111111111111111.

If a computer has N words ofmemory, we need log

N bits to 2

identify each word.