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mvkk's avatar
mvkk
Icon for New Contributor rankNew Contributor
3 years ago

create clock on combo logic output

Hi,

I need to create clock definition on combo logic output. What is the way to do clock definition?

I tried to add LCELL on the combo gate output and tried creating clock on LCELL.out pin. However, this did not work.

Can you please help with some way to define clock on combo logic output?

Thanks for your help!!

5 Replies

  • FvM's avatar
    FvM
    Icon for Super Contributor rankSuper Contributor
    3 years ago

    Hello,
    although it's generally bad design practice and typically causes problems in timing closure, it's basically possible to feed a register clock port from a LCELL output. It's however not possible to feed e.g. a PLL input. What are you exactly trying to achieve?

    Regards

    Frank

  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hi,


    Appreciate your effort to reaching out to Intel FPGA Community.


    Can you also share what device are you targeting?


    Regards,

    Aqid


  • mvkk's avatar
    mvkk
    Icon for New Contributor rankNew Contributor
    3 years ago

    Hi

    I am using Arria 10, 10AS066H2F34.

    Creating a clock on LCELL instance output did not work for me.

    Thanks

    Kishor

  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

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