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What's the reason for XST warnings about overused bonded IOBs?

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555lin

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Guys, tell me please in which case should I list all the signals in the process and
in which case not all of them?

After synthesis in XST I got number of bonded IOBs overused 133%. I don't
quite understand what can be the reason for this.
 

tkbits

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Re: XST warning question

The number of IOB's is related to the number of pins you will use. Thus it is determined by the number of input/output signals in the top level module.

The number of pins you will use is a design choice, so either you are asking for too many pins for the chip you're using, or your chip is too small for your design.
 

    555lin

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amitgangwar_vlsi

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Re: XST warning question

check the device manual or data sheet...
in your design number of input and outputs are greater than the
available i/o pins on device.........
 

FrankCh

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XST warning question

You may need to remove some unnecessary IO pins or simply use a larger FPGA chip.
 

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