PEX8714, PCI Express Gen3 Switch, 12 Lanes, 5 Ports

© PLX Technology, www.plxtech.com

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10Sep12; v1.0

performancePAK

TM

Exclusive to PLX, performancePAK is a suite of unique

and innovative performance features which allows

PLX’s Gen 3 switches to be the highest performing Gen

3 switches in the market today. The performancePAK

features consists of Multicast, and Dynamic Buffer Pool.

SSC Isolation

The PEX8714 employs a multi-clock domain which

allows the user to terminate Spread Spectrum Clock

enabled domains. Terminating the SSC clock removes

the need to pass a common clock across a backplane.

The PEX8714 supports SSC isolation on four of its

ports.

visionPAK

TM

Another PLX exclusive, visionPAK is a debug

diagnostics suite of integrated hardware and software

instruments that users can use to help bring their systems

to market faster. visionPAK features consist of

Performance Monitoring, SerDes Eye Capture, Error

Injection, SerDes Loopback, and more.

Performance Monitoring

The PEX8714’s real time performance monitoring

allows users to literally “see” ingress and egress

performance on each port as traffic passes through the

switch using PLX’s Software Development Kit (SDK).

The monitoring is completely passive and therefore has

no affect on overall system performance. Internal

counters provide extensive granularity down to traffic &

packet type and even allows for the filtering of traffic

(i.e. count only Memory Writes).

SerDes Eye Capture

Users can evaluate their system’s signal integrity at the

physical layer using the PEX8714’s SerDes Eye Capture

feature. Using PLX’s SDK, users can view the receiver

eye of any lane on the switch. Users can then modify

SerDes settings and see the impact on the receiver eye.

Figure 5 shows a screenshot of the SerDes Eye Capture

feature in the SDK.

Figure 3. SerDes Eye Capture

Error Injection & SerDes Loopback

Using the PEX8714’s Error Injection feature, users can

inject malformed packets and/or fatal errors into their

system and evaluate a system’s ability to detect and

recover from such errors. The PEX8714 also supports

Internal Tx, External Tx, Recovered Clock, and

Recovered Data Loopback modes.

Applications

Suitable for host-centric as well as peer-to-peer traffic

patterns, the PEX8714 can be configured for a wide

variety of form factors and applications.

Host Failover

The PEX8714 can also be utilized in applications where

host failover is required. In the below application

(Figure 8), two hosts may be active simultaneously and

controlling their own domains while exchange status

information through doorbell registers or I

The devices can be programmed to trigger fail-over if

the heartbeat information is not provided. In the event of

a failure, the surviving device will reset the endpoints

connected to the failing CPU and enumerate them in its

own domain without impacting the operation of

endpoints already in its domain.

Figure 4. Host Fail-Over