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Intel
®
31154 133 MHz PCI Bridge Design Guide Design Guide 33
PCI/PCI-X Interface
Table 8. PCI-X Clocking Modes
PCI-X Mode PCI Mode
PCIXCAP (pin on
PCI connector)
P_M66EN
Not capable 33 MHz GND GND
Not capable 66 MHz GND Not connected
PCI-X/66 MHz 33 MHz Pull down GND
PCI-X/66 MHz 66 MHz Pull down Not connected
PCI-X/133 MHz 33 MHz Not connected Ground
PCI-X/133 MHz 66 MHz Not connected Not connected
Table 9. Secondary Bus Frequency Initialization
S_M66EN S_PCIXCAP S_MAX100
Conventional PCI
Frequency
PCI-X Frequency
Typical Slot
Loading
1
Ground Ground – 33 MHz Not capable
Not connected Ground – 66 MHz Not capable
Ground Pull-down – 33 MHz PCI-X 66 MHz
Typical setting for
four slots
Not connected Pull-down – 66 MHz PCI-X 66 MHz
Ground Not connected 1 33 MHz PCI-X 100 MHz
Not Connected Not Connected 1 66 MHz PCI-X 100 MHz
Typical setting for
two slots
Ground Not Connected 0 33 MHz PCI-X 133 MHz
Not Connected Not Connected 0 66 MHz PCI-X 133 MHz
Typical setting for
one slot
NOTE:
1. Simulation is suggested for any deviation from typical slot loading recommendations.