In the section B14.5.1.2 Determining when to move to ACTIVATE or DEACTIVATE in IHI0050 - G AMBA® CHI Architecture Specification,
It says like below,
When remaining activity is getting response and sending last flit,
at the same time, if RXLINK of the transmitter is in DEACT state and all credit have returned,
It seems deadlock because RXLINK can not go back to ACT state according to B14.6.2 Tx and Rx state machines ,
and TXLINK must remain in RUN state according to sentence attached first in this query.
I am sharing an example which is applicable, as I think, to above case.
1. RN send CompAck with Last Credit and RN.TXLINK & ICN.RXLINK goes to DEACT state.
2. At the same time, Snoop Request goes to ICN to RN.
3. ICN.TXLINK can not proceed to DEACT state because previous Snoop request is not done.
4. RN.TXLINK can not send Snoop Response to ICN because all Credit is returned and can't get new Credit
5. both LINK can not proceed to next state and get stucked
Is this case something that could happen?
It would be helpful If you can tell me something I missed on the spec.
thanks
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