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Write Hit in Shared State is there any way where i could do the write operation without wait in for invalidation ACK in ACE

Kidilam Firoz

Hello, In AMBA ACE for a write miss we could us the ReadUnique Transaction, it says the transaction will snoop and get the data and invalidate the copies, the ACK from the Invalidated snoop masters/slave is required for the completer to do give the response, So on a hit in a shared state cache line still required to invalidate the copies and wait for the ACK to complete the Write right.consider my interconnect is slow take about 100 cycles for snoop req and resp, there any way where i could save those cycles..?

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  • 0 in reply to vstehle
    Actually what i am saying that transaction is there
    consider a scenario in multicore where i have a cache line with Shared State now a write request from the CPU came and it is a HIT, so what i have to do is invalidate the other copies right? for that i am giving a transation request with ReadUnique/CleanUnique to the Interconnect. Invalidation ACK will be recived after other copies get invalidated , then only i could give response to the Write Request.
    What i am asking is that in a Write Hit Condition after senting the Invalidation REQ is there any way i could give response to the Write Hit Request without waiting for the Invalidation ACK Response
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  • 0 in reply to vstehle
    Actually what i am saying that transaction is there
    consider a scenario in multicore where i have a cache line with Shared State now a write request from the CPU came and it is a HIT, so what i have to do is invalidate the other copies right? for that i am giving a transation request with ReadUnique/CleanUnique to the Interconnect. Invalidation ACK will be recived after other copies get invalidated , then only i could give response to the Write Request.
    What i am asking is that in a Write Hit Condition after senting the Invalidation REQ is there any way i could give response to the Write Hit Request without waiting for the Invalidation ACK Response
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