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Developing CPCI board, doesn't receive IO commands

Started by Unknown October 24, 2007
I'm developing a CPCI board and need help getting the IO commands to
work.

It works fine when plugged into a PCI chassis with an adapter, but
when plugged into a CPCI chassis, it doesn't receive any IO read or
write commands.

The board is recognized and the PCI config registers and the memory
space are accessible.  The IO space is not.

When addressing IO space, there is no frame pulse and no activity on
the four PCI command bits.

Could it be that the CPCI chassis is filtering commands and preventing
the IO commands?

Thanks for any suggestions you can give.

Eric