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In AXI, low-power mode uses CSYSREQ, CSYSACK and CACTIVE three signal to realize the function, but I think only CSYSREQ and CACTIVE can realize the fuctionk, CSYSACK seems to be unnecessary?
Hello,
although I am not familiar to the low power mode, CACTIVE indicates the clock control.
When entering the low power mode, the peripheral cannot assert CSYSACK without the clock supply.
In the case, if CACTIVE and CSYSACK are low, the clock will stop.
When exiting from the low power mode, the peripheral cannot assert CSYSACK without the clock supply.
In the case, if CSYSREQ is high and CACTIVE is low, the clock will start.
After all, CSYSACK will need to indicate the peripherals begin to work.
If the peripherals are stopping, the masters cannot issue commands to the peripherals.
Best regards,
Yasuhiko Koumoto.
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Tanks very much!