Snoopy Cache [ Goodman 1983 ]

• Idea: Have cache watch (or snoop upon) DMA transfers, and then “do the right thing”

• Snoopy cache tags are dual-ported

Proc.

Cache

Snoopy read port

attached to Memory

Bus

Data

(lines)

Tags and

State

A

D

Used to drive Memory Bus

when Cache is Bus Master

A

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