caching - MMU and Cache access -


currently exploring mips microaptiv mmu architecture.

i looks pretty simple has 1 thing can't understand , isn't explained in docs.

here example of fmt based mmu: http://snag.gy/euzuz.jpg

fmt takes vpn , returns ppn.

cache simultaneously takes vpn , returns ppn well.

so question is: need comparator for?

if found ppn in ram cache why need compare fmt?

my understanding incomplete here.


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