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XPLA3 bidirectional bus

Hi all,

I implemented a bidirectional bus using tristate buffer inside a XPLA3 device. The CPLD is interconnected to an external device by this bidirectional bus. The problem is that I cannot write or read the contents of external device. The timing is correct, I have a doubt: could be possible that the external device has no such output current to drive a low on the bus when the bidirectional bus inside the CPLD is in read direction? Someone know issue about implementation of bidirectional bus using XPL3 device?

Thanks, Maroc

Reply to
Maroc
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There should be a fitter report file, look at that, and see if the eqns look ok for .oe and .io feedback from the pins. You can check drive ability with a multimeter.

-jg

Reply to
Jim Granville

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