Slot 1 Pci Express* X8 Connector; I/O Module Connector; Table 12. Intel ® I/O Expansion Module Bus Pewidth Bits - Intel S5500WB Technical Product Specification

Functional Architecture
The PEWIDTH is pulled up to 3.3 V Aux on the baseboard and grounded, if necessary, by the
riser. The baseboard provides an inverter and voltage level translator before passing this signal
to the IOH.
3.13.3

Slot 1 PCI Express* x8 Connector

Slot 1 provides a PCI Express* x4 bus on an x8 connector, if provided, for use in a 2U chassis
that uses LP boards without risers. Although it is feasible to use the IOM at the same time, it
would require 2U chassis back panel changes.
3.13.4

I/O Module Connector

Mezanine connectors are provided to support the various I/O modules, both the older Gen 1 I/O
modules supported by Intel
modules supported by the Intel
Board S5500WB.
®
The Intel I/O Expansion Module is also required to inform the IOH of the Intel
Module Bus usage, PEWIDTH bit 1 is to be used for this.
Table 12.
Intel I/O
®
Expansion Module
one x8
two x4
36
®
Server Board S5000PAL and newer, double-wide Gen 2 I/O
®
Server Board S5520UR are supported on the Intel
®
Intel I/O Expansion Module
Description
1 x8 PCI Express* target
device
2 x4 target devices
Intel order number E53971-004
Intel® Server Board S5500WB TPS
®
I/O Expansion
Bus PEWIDTH Bits
PEWIDTH1 - Pin 2
0
1
®
Server
Revision 1.3