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DS90CF384A RxOUT output timing

Seishin
Genius 4135 points
Other Parts Discussed in Thread: DS90CF384A, DS90CR286AT-Q1

Hi,

Q1. I would like to know if I understand it correctly.

　   RxOUT is output from DS90CF384A in synchronization with the rising edge of RxCLK OUT.

      

Q2. I want to use the DS90CF384A at 25MHz(40ns) of the shift clock.

      Are RSRC and RHRC of f=25MHz same as a value of f=65Mz?

Best regards,
Seishin

  • 0
    TI__Mastermind 29655 points
    Hi Seishin-san,

    A1. Yes. the RxOUT transitions in-sync with the RxCLKOUT. This allows the endpoint display to strobe on the clock's falling edge.

    A2. The setup and hold time minimum at f = 25 MHz will be slightly larger than at f = 65 MHz. For example, if you look at a similar device (DS90CR286AT-Q1), the RSRC and RHRC minimum values are about 2 ns longer for f = 40 MHz compared to f = 65 MHz. I think that for f = 25 MHz, you may see another 2 ns increase in the minimum. However, we do not have characterization data for this specific clock rate, as the most stringent RSRC and RHRC condition is at the maximum clock frequency.

    Regards,

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Genius 4135 points

    Dear Michael,

    Thank you very much.

    I understand.

    Sincerely,

    Seishin