Write Allocate versus Not Allocate

• Assume: a 16-bit write to memory location 0x0 and causes a miss

  • Do we read in the block?
    Yes: Write Allocate
    
    No: Write Not Allocate

Cache Index

0

1

2

3

:

Cache Data

Byte 0

0

4

31

:

Cache Tag

Example: 0x00

Ex: 0x00

0x00

Valid Bit

:

31

Byte 1

Byte 31

:

Byte 32

Byte 33

Byte 63

:

Byte 992

Byte 1023

:

Cache Tag

Byte Select

Ex: 0x00

9

Dirty-bit

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