Filter
Top Products
Intel
®
31154 133 MHz PCI Bridge Design Guide Design Guide 29
PCI/PCI-X Interface
PCI/PCI-X Interface 5
This chapter provides guidelines for designing with the Intel
®
31154 133 MHz PCI Bridge
PCI/PCI-X bus interface in your application.
5.1 PCI/PCI-X Voltage Levels
The Intel
®
31154 133 MHz PCI Bridge supports the 5 V PCI signaling interface as well as 3.3 V.
Table 6 is provided as a reference for the PCI/PCI-X signaling levels. A complete PCI-X
Addendum to the PCI Local Bus Specification, Revision 1.0a can be found on the www.pcisig.com
website.
5.2 Interrupt Routing
The 31154 does not use PCI INT lines (INTA, INTB, INTC and INTD). These pins are usually
routed from the primary to secondary PCI buses, bypassing the bridge.
Table 6. PCI/PCI-X Voltage Levels
Symbol Parameter Minimum Maximum Units
V
IL3
Input low voltage (PCI-X) -0.5 0.35 × V
CC33
V
V
IH3
Input high voltage (PCI-X/PCI) 0.5 × V
CC33
V
CC33
+0.5 V
V
IL4
Input low voltage (PCI) -0.5 0.3 × V
CC33
V
V
OL3
Output low voltage (PCI-X) 0.1 × V
CC33
V
V
OH3
Output high voltage (PCI-X) 0.9 × V
CC33
V