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Intel
®
31154 133 MHz PCI Bridge Design Guide Design Guide 9
Introduction
Introduction 2
2.1 Product Overview
The Intel
®
31154 133 MHz PCI Bridge (called hereafter the “31154”) is a PCI component that
functions as a highly concurrent, low-latency transparent bridge between two PCI buses. The
31154 can operate as a PCI-to-PCI bridge in the configurations shown in Table 2.
The 31154 is used on motherboards to provide additional I/O expansion slots. It is also used on PCI
add-in cards to mitigate the restrictive electrical loading constraints imposed on an expansion slot,
enabling multiple conventional PCI or multiple PCI-X devices to reside on a single PCI I/O
adapter. The 31154 block diagram in Figure 1 indicates potential 31154 applications for a range of
PCI bus speeds.
Table 2. PCI-to-PCI Bridge Configurations
Primary Bus Interface Secondary Bus Interface
PCI 2.3 PCI 2.3
PCI 2.3 PCI-X
PCI-X PCI 2.3
PCI-X PCI-X
Figure 1. Intel
®
31154 133 MHz PCI Bridge Applications
PCI-X Bus
Legacy
33 MHz
Legacy
66 MHz
PCI-X Bus 66 MHz Slots
Multi PCI-X
Devices
PCI-X Bus 100 MHz Slots
High-End
Application
CPU Host
PCI-X Bus 133 MHz Slot