Problem with the number of bonded IOBs that exceeded in Virtex 4

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ramzitligue

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HI,
i use virtex 4(XC4VLX80),the problem is that Number of bonded IOBs exeeded because the program use 1298 bonded IOBs and this number is not available.haw can i optimise my code?what's the solution?
 

virtex 4

Hi,

I also faced the same problem. Are u designing a block of project? Or for the whole design?

Try to remove unnecessary registers and wires. Then synthesis and check once again..

Regards
Deepak
 

Re: virtex 4

i make a component(fifo,connector) that contains a lot of input_vector(32 bit) and output_vector(32 bit) so after implementation the problem is that the Number of bonded IOBs exeeded(1200) when only 780 bonded IOBs are available in virtex4 .have you a solution ?

Added after 2 minutes:

i can't reduce width 32 bit because i work with processor miniMIPS (32 bit)
 

virtex 4

Do you really need to connect all 1298 signals to external devices on your FPGA circuit board? If yes, then you need a larger FPGA. If not . . .

FPGA students sometime make the mistake of trying to synthesize a high-I/O module that's intended for internal use as if it were the project's top-level module. If that's your situation, then you can build a top-level module that instantiates the big module, and then connects only the necessary signals to the FPGA I/O pins.
 

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