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  1. #1
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    Connection for unused dual purpose pins of CPLD

    Hi,

    I am trying to make hardware with a CPLD (XC2C256). It has a few dual purpose pins. If I am not using them, what should I do with it. Should I gnd them for better ESD? For eg. Pin 1-4 have dual function of global output enable (VQ100 package- pin out on page 18 of datasheet). If I am not using these pins as IO pins and gnd them, will it not disable the output of the entire IC? Also, if I want to use the pins as IO pins and give logic 0 as input, again will it not disable the output of the entire IC?

    Datasheet link : Here

    Thanks,
    Hobbyiclearner

    •   Alt10th May 2018, 11:56

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  2. #2
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    Re: Connection for unused dual purpose pins of CPLD

    The "data sheet" is really more of an overview. Try this one: User Guide
    Look at the section for "Terminations" and I think all of your questions will be answered, plus allow you some options that might not have occurred to you.



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