Artesyn ATCA-9405 Installation and Use (May 2014) - Manual (Page 101)

Chapter 6
ATCA-9405 Installation and Use (6806800M71G) 101
Service Infrastructure
6.1 Overview
The Service Processor (SP) monitors and controls the infrastructure of blade and RTM through
high speed PCIe interfaces. Connection between the PCIe root complex and PCIe endpoints is
provided through PEX8608, a fully non-blocking, low latency, and low power 8-lane, 8-port
PCI-Express Gen 2 switch.
The PEX8608 provides up to eight configurable PCIe ports with x1or x2 link width (number of
lanes per unique link). The port numbers are 0, 1, and 4-9 as defined in
Table 6-1 . Any of the
ports can be designated (or dynamically changed) to be the upstream port, that provides
connection towards the PCIe root complex.
Link width auto negotiation, dynamic lane reversal, and polarity reversal during link training
process is supported for all ports. Other features of the switch are:
 Integrated 2.5 or 5.0 GT/s SerDes speed negotiation per port
 Non-blocking crossbar switch architecture
 Low packet latency and high performance
 PCIe power management
 Quality of service, reliability, availability, and serviceability features
 Out-of-Band initialization options
 JTAG support
6.2 Port Configuration
Port configuration is a part of the PEX8608 initialization process that starts upon exiting from
the fundamental reset through PEX_PERST# reset input. The configuration of upstream port,
port width, and other hardware modes are initially set by hardware strapping signals.