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What is CTRLR.CLKFACK bit in C5535 USB Controller?

j-breeze
Mastermind 7560 points

Hi, Champ,

According to C553x TRM SPRUH87C Page-450, there is CLKFACK bit in Control Register (CTRLR).
So, could you please let me know how it works when I set it to "1" (enabled)?

Thanks in advance for your cooperation.

Best regards,
j-breeze

  • 0
    TI__Genius 12575 points

    Hello J-breeze,

    This register bit in the USB Control register allows for fast responding to the clock stop request. If this bit is enabled, this module will return a clock stop ack in the next clock cycle and not wait for current DMAs to finish.

    The system will need to be tolerant of a possible loss of the DMA request if this occurs.

    Hope the above information helps.

    Regards

     Vasanth

  • 0 in reply to Vasantha K
    Mastermind 7560 points

    Hi Vasanth,

    Thank you for your information.

    So, is there any case that I should use the fast responding?
    If you have any, please let me know.

    Best regards,
    j-breeze

  • 0 in reply to j-breeze
    TI__Genius 12575 points

    Hello j-breeze,

    This bit may not be relevant at IP level as clock stop and clock stop acknowledge is taken care at system  level. 

    As mentioned in the specification, at System level there exists a clock stop/ACK register, to request the clock stop for  the peripheral, and peripheral sends the clock stop Acknowledge which will be registered and accordingly stops the clock to the respective peripheral.

     Hope the above information helps

    Regards

    Vasanth

  • 0 in reply to Vasantha K
    Mastermind 7560 points

    Hi Vasanth,

    I thank you for your help.

    Best regards,
    j-breeze