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31154 133 MHz PCI Bridge Design Guide Design Guide
PCI-X Layout Guidelines
7.2.4 PCI-X at 33 MHz
The 31154 supports running in an eight-slot PICMG 1.2 style passive backplane environment at
33 MHz. To verify this, simulations were run based on the trace impedance of 57 Ω ± 10%.
7.2.4.1 Embedded PCI-X Specification PICMG 1.2 Overview
The Embedded PCI-X (ePCI-X) Specification PICMG 1.2 is a specification supported by the PCI
Industrial Computer Manufacturers Group. ePCI-X system host boards (SHBs) are defined in two
form factors: full-size and half-size. The full-size SHB length is identical to the ISA long board
length. Half-size SHB form factor is based on the popular half-size ISA board.
7.2.4.2 PICMG 1.2 System Overview
An ePCI-X system is composed of one ePCI-X system host board (SHB) and an ePCI-X
backplane. The SHB provides arbitration, clock distribution, and reset functions for all expansion
boards. The SHB is responsible for performing system initialization by managing the IDSEL signal
of each local board. Physically, the SHB slot can be located at any slot in the backplane.
Electrically, it must be at the end of each of primary PCI/PCI-X bus.