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CDCE6214: Output Enable function

Motoyasu Hattori
Genius 11235 points
Part Number: CDCE6214


Hi,

Enable (OE) : High" but "Individual Output Enable(OE1～OE4): Low" cases, I want to know whether OUTx pin output clock or not?  Please advise us.

Thanks and best regards,
M.HATTORI.

  • 0
    TI__Genius 11235 points

    Hi,

    On "Global Output Enable (OE) : High" but "Individual Output Enable(OE1～OE4): Low" cases, I want to know whether OUTx pins output clock or not.  Please advise us.

    Thanks and best regards,
    M.HATTORI.

  • 0 in reply to Motoyasu Hattori
    TI__Mastermind 29522 points

    Hi Motoyasu, 

    OE should be high to enable the output. 

    Regards, 

    Vicente 

  • 0 in reply to vicente flores prado
    TI__Genius 11235 points

    Vicente-san,

    I want to confirm the following.  Please let us know.

    *1.

    In my understanding,

    "Output clock" is only the following condition.

    GPIO as Global Output Enable (OE) =HIGH, GPIO as Individual Output Enable (OE1-OE4) =HIGH

     

    Other following cases are "Disable Clock".

    GPIO as Global Output Enable (OE) =HIGH, GPIO as Individual Output Enable (OE1-OE4) =LOW

    GPIO as Global Output Enable (OE) =LOW, GPIO as Individual Output Enable (OE1-OE4) =HIGH or LOW

     

    Is it correct?  Please advise us.

     

    *2.

    Could you please let us know the SSC Enable or Disable under the following conditions?

    R41[bit 15] SSE_EN=HIGH, GPIO as SSE_EN =HIGH  :-->  SSC is Enable

    R41[bit 15] SSE_EN=HIGH, GPIO as SSE_EN =LOW   :-->  SSC  Enable or Disable ??

    R41[bit 15] SSE_EN=LOW , GPIO as SSE_EN =HIGH  :-->  SSC  Enable or Disable ??

    R41[bit 15] SSE_EN=LOW , GPIO as SSE_EN =LOW   :-->  SSC is Disable

    Thanks and best regards,
    M.HATTORI.

  • 0 in reply to Motoyasu Hattori
    TI__Mastermind 29522 points

    Hi Motoyasu,
    Yes you're understanding of part one is correct. 
    In regards to part two, it appears in pin mode, GPIO as an input has higher priority so even if R41[15] is set to low , If GPIO is set as SSC_EN and SSC_EN = HIGH, SSC will be enabled.

    Regards, 

    Vicente  

  • 0 in reply to vicente flores prado
    TI__Genius 11235 points

    Vicente-san,

    My customer sets the following,  As your comments, Output is disable, but CDCE6214 outputs clock.

    • GPIO1 : Assign OE3   ->  External pull-down (Low)
    • GPIO4 : Assign Global OE   ->   External pull-up (High)

    Are there any other setting to output disable/enable?

    Please advise us.

    Thanks and best regards,
    M.HATTORI

  • 0 in reply to Motoyasu Hattori
    TI__Mastermind 29522 points

    Hi Motoyasu, 
    In this case since global OE is pulled high, this will still result in output clocks. 
    No, there are not any more settings to enable/disable. 

    Regards, 

    Vicente 

  • 0 in reply to vicente flores prado
    TI__Genius 11235 points

    Vicente-san,

    Again, could you please let us know the following cases?

    GPIO as Global Output Enable (OE) =HIGH, GPIO as Individual Output Enable (OE1-OE4) =HIGH  ->  Enable Output

    GPIO as Global Output Enable (OE) =HIGH, GPIO as Individual Output Enable (OE1-OE4) =LOW  ->  ??

    GPIO as Global Output Enable (OE) =LOW, GPIO as Individual Output Enable (OE1-OE4) =HIGH  ->  ??

    GPIO as Global Output Enable (OE) =LOW, GPIO as Individual Output Enable (OE1-OE4) =LOW  ->  Disable

    Please advise us.

    Thanks and best regards,
    M.HATTORI.

  • 0 in reply to Motoyasu Hattori
    TI__Genius 10995 points

    Hello Motoyasu,

    Based on p. 28 of the data sheet and p. 30 on Table 17, if OE = HIGH, then it enables all differential outputs after 4 internal clock cycles. However, if any of the Individual Output Enable (OE1 - OE4) = LOW, then the output for that channel should be disabled. 

    Therefore,

    Motoyasu Hattori said:
    GPIO as Global Output Enable (OE) =HIGH, GPIO as Individual Output Enable (OE1-OE4) =LOW  ->  ??

    This one should be LOW for the OEX = LOW (so if all 4 OEX are LOW then all outputs will be disabled).

    Motoyasu Hattori said:
    GPIO as Global Output Enable (OE) =LOW, GPIO as Individual Output Enable (OE1-OE4) =HIGH  ->  ??

    This one should be HIGHfor the OEX = HIGH (so if all 4 OEX are HIGH then all outputs will be enabled). Hope this helps!

    Good Luck,

    Andrea

  • 0 in reply to Andrea Vallenilla
    TI__Genius 11235 points

    Hi,

    I am a little confusing.  My customer wants all-output-clock after power-up.  On this case, the following pins are also "external pull-up".  Is it correct?  Please let us know.

    • Global OE (GPIO4) : Pull-up
    • Output Enable 3 (OE3) (GPIO1) : Pull-up

    He can not change the internal initialization data on CDCE6214.

    Thanks and best regards,
    M.HATTORI.

  • 0 in reply to Motoyasu Hattori
    TI__Genius 10995 points

    Hello Motoyasu-san,

    The values I gave you is what I interpreted from the data sheet; however, I will double check your question with my coworkers by the end of this week when they are back from out of office.

    Best,

    Andrea

  • 0 in reply to Andrea Vallenilla
    TI__Genius 10995 points

    Hello Motoyasu,

    That is correct. When the GPIO3/4 pins are set to input (which is the default), there is a weak pull-up resistor of 50 kΩ. Hope this helps.

    Good luck,

    Andrea