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42 • ePCI-X Bus Details
6.2.5 PME#
The NuPRO-850 implement PME# signal and connect it to 6300ESB
6.3 PCI-X Bus Signals
6.3.1 Backplane Present
The a_PRSNT# and b_PRSNT# signals are connected to the super I/O chip’s
GP25 and GP26 pins respectively. These signal are pulled to +3.3V via 4.7k
resistors.
6.3.2 VIO Electrical Keying
NuPRO-850 monitors the VIO keying signals from backplane.
6.3.3 M66EN and PCIXCAP
The Bus-A supports up to PCI-X 66, the M66EN, and PCIXCAP of Bus-A and
Bus-B can be used to program the PCI mode.