Chapter 1
Overview
PCI-X I/O
15
Figure 1-8 I/O Subsystem Architecture
PCI-X Power Board
The PCI-X power board (PCI-X PB) contains six DC-DC converters, over-voltage protection, filter components,
in-rush current limiting circuitry, the local power monitor (GIOLPM) CPLD, and various status and control
logic devices. It provides DC power (+1.5,+1.8V, +3.3V, +5V, +12V, -12V and +5V_HK) to the PCI-X I/O
backplane boards.
The PCI-X PB mounts under the backplane board connected by the transfer board and secured by a frame to
form one hot-swappable assembly. All electrical connections between the two boards are made by the transfer
board.
Each power board contains one power monitor, which enables and monitors the DC power converters and
reports status to the utilities subsystem. The power monitor also contains a reset delay circuit and an ID
transmitter circuit for REO cable exploration.
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