GE C2K Hardware Reference Manual page 58

Functional Blocks
When the C2K is installed in a peripheral slot, the PCI 6254 operates in the Universal
Non-transparent mode. To the PCI host, which would be located on the system controller board,
the PCI 6254 appears to be another PCI device. The mode in which the PCI 6254 operates is
controlled by the SYSEN# signal from the backplane (cPCI_J2 C2). SYSEN# is asserted when
the C2K is installed in a system slot and de-asserted when the C2K is installed in a peripheral slot.
NOTE: The cPCI 64EN# backplane signal is connected to the PCI 6254 64EN# input pin. The
state of 64EN# can be determined by an internal PCI 6254 register. If the 64EN# indicates 32-bit
only, no 64-bit accesses should be allowed to the PCI 6254 primary side.
C2K User's Guide 4-10
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