Hi-Speed USB Device PHY with UTMI Interface

Datasheet

6.2High-speed Signaling Eye Patterns

High-speed USB signals are characterized using eye patterns. For measuring the eye patterns 4 points have been defined (see Figure 6.3). The Universal Serial Bus Specification Rev.2.0 defines the eye patterns in several ‘templates’. The two templates that are relevant to the PHY are shown below.

TP1 TP2

TP3

TP4

Traces

TransceiverA Connector

USB Cable

Traces

BTransceiver

Connector

Hub Circuit Board

Device Circuit Board

 

Figure 6.3 Eye Pattern Measurement Planes

Revision 1.5 (11-15-07)

18

SMSC USB3280

 

DATASHEET