Question about CHI spec

Jinyu Dong 21 days ago

In CHI.G Chapter B2.9.2.1 metioned that "The AllowRetry field must be asserted the first time a transaction is sent.",

but in AMBA CHI C2C spec B4,1,2 said the Request Retry flow dose not support in C2C,and AllowRetry field can not be transfer.

So is seems mismacth between two Spec, so when AllowRetry bit is after the C2C to the remote die is 0, and not satisyied the CHI spec"The AllowRetry field must be asserted the first time a transaction is sent."

Is it acceptable and any risk?

I'm looking forward to your replay.

Thanks a lot!

Top replies

Ben Hicks 21 days ago +1 verified

You're correct that there is a difference between the two protocols here, and this is expected to be handled by the C2C gateway. Consider a system where Chip1 has an RN, and Chip2 has the assocaited...
Ben Hicks 17 days ago in reply to Jinyu Dong +1 verified

Hi Jinyu, 1. The gateway logic is ultimately what is used to convert between on-chip CHI, to packed CXS. Ultimately, it is the logic that implements the Protocol to Link Layer mapping, when viewed in...