Intel NuPRO-850 PCI-X Bus Signals, 6.2.5 PME#, Backplane Present, VIO Electrical Keying

6.2.5PME#

The NuPRO-850 implement PME# signal and connect it to 6300ESB

6.3PCI-X Bus Signals

6.3.1Backplane 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.

6.3.2VIO Electrical Keying

NuPRO-850 monitors the VIO keying signals from backplane.

6.3.3M66EN 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.

42 • ePCI-X Bus Details