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  1. #1
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    Force fitting block without drive output

    Hi

    Is there a way to force fitting even thoug there is not output drive? (it's for corner cases where it is necessary to determine the usage of resource)

    thanks
    Gil

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  2. #2
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    Re: Force fitting block without drive output

    If a design has no outputs, then it has no purpose. If there are no outputs, then resource usage will always = 0, regardless of corner case.

    If you are referring to leaving outputs unconnected, then yes, you can force the fit in both Altera and Xilinx, but the XIlinx option is a bit of a fudge.

    Altera/Intel: assign all outputs you want unconnected to virtual pins. Then they will remain in place when fitted.
    Xilinx - you have to connect the outputs to a pin or they will be removed. Xilinx does not offer virtual pins.


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  3. #3
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    Re: Force fitting block without drive output

    FWIW, Xilinx does have a way to do this: https://forums.xilinx.com/t5/Impleme...ct/td-p/782812 . I've left the link just in case someone searches for something like "determine resources without fpga" or the like.



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