64bit PCI card data reading issue using 2slot 64bit Unit

[for...@magma.com]

Data Writing is Ok.
Data writing from Laptop PC to PCI card has no problem.
The High 32bits data and low 32bits data of 64bit data are normally
written.

Data Reading problem.
Problem occured When the data if read from PCI card

Using 2slot 64Bit chassis running 64Bit PCI card.
Data transmitted from the bus slot, the high 32bits were transmitted
twice



Problem Solution:
Use 1slot or 4slot chassis, these are 32bit PCI units.
PCI card was able to operate in 32bit backplane of 1SLOT AND 4SLOT


Problem Found:

Ccompared the 1slot,and 4slot 32bit units againts the CB264 designs.
The PCI bridge chip is the same in each design so that is not the
problem, but how the cards handle the 64-bit request is different;
which may be where the problem is.

Conclusion: at this point that the small difference in the designs is
causing a timing issue with 64-bit cards and this is what is causing
the problem with the CB264 with the PCI cards.
Just don't know root cause.