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