Dirty Bits for Write-Back Caches

Byte

Byte

tag of A

Memory

Proc.

Tag

Data Block

D

V

tag of B

<A>

<A+1>

<B>

<B+1>

0

1

0

1

0

0

0

1

0

0

0

0

When the line corresponding to A is replaced,

its data block has to be written to main memory

since its dirty bit is set.

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