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LMK04803 READBACK operation when READBACK_LE＝0

toshi-e2e
Genius 4830 points
Other Parts Discussed in Thread: LMK04803

Hi! all,
According to 8.5.3 Readback of the datasheet of LMK04803, 
"If READBACK_LE = 1, the LEuWire line may now be lowered. It is allowable for the CLKuWire pin to
be clocked additional cycles, but the data on the readback pin will be invalid."

If the READBACK_LE=0, and the CLKuWire is clocked additional cycles, is the data on the readback pin invalid?
Customer wants to send 32 clocks instead of 27 clocks.

Regards,
Toshi

  • 0
    TI__Expert 3520 points

    Hello Toshi,

    would you please clarify, why the customer is willing to send 32 clocks edges? are they expecting to get the 5 address bits back?

    The first 27 clocks will bring out valid data anyway, after that, any extra clocks would generate invalid data.

    So if the customer is asking if it's possible to send extra clocks, then answer is yes, This will not invalidate the already clocked out data bits. but if the question is can we read back the address bits using extra clocks, then the answer is no, any clock edge after the 27th will generate invalid data.

    Cheers,

    Ahmed

  • 0 in reply to Ahmed Noeman
    Genius 4830 points
    Hi, Ahmed-san,
    Thanks for your reply.
    They plan to use a controller which IP core for accessing LMK04803 sends 32 clocks always.

    Thanks and regards,
    Toshi
  • 0 in reply to toshi-e2e
    TI__Expert 3520 points

    Hi Toshi-san,

    Then, they simply ignore data after the 27th cycle.

    Cheers,

    Ahmed