Dear Supporter,
In IHI0098A chi c2c spec Chapter B2.1, message transfer structure from CHI interface to chip pins can be formed of the following layer:
• Protocol layer• Packetization layer• Link layer• Physical layer
There are some question about the handshake releate signal.
1. When the Protocol layer prepare to initiate a state change request (Active -> Low Power), Accroding to the UCIe arch, Since the state reqeust initiated, during the chi-c2c dapapath in Packetization layer and the Link layer will be stalled.
So I wish to know the recommended behavior of the following CHI interface when state change into Low Power:
LINKACTIVEREQ, LINKACTIVEACK
SYSCOREQ, SYSCOACK
2. Also when the Protocol layer prepare to initiate a state change request (Active -> Inactive status) ,such as disable/linkreset/linkerror in UCIe. since such a state request initiated, the datapath will be flushed and reset,
So similarly, I wish to know the recommended behavior for the above signal when state change into Inactive
From my understanding now, i thought it's safe for all the necessary handshake to be completed before the state request change from Active, so during the state change period, the handshake signal releated c2c message will have no risk to be stalled or flushed in local die, and the handshake signal should not change during the state changing period. When the state change done, the handshake signal can be changed again with no risk.
I wish to know your opinions.
Best Regards