SMSC USB3280 Bedienungsanleitung PDF herunterladen (Seite 18)

Hi-Speed USB Device PHY with UTMI Interface

Datasheet

Revision 1.5 (11-15-07) 18 SMSC USB3280

DATASHEET

6.2 High-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.

Figure 6.3 Eye Pattern Measurement Planes

USB Cable

Transceiver

Device Circuit Board

Transceiver

Hub Circuit Board

Connector

Traces Traces

Connector

TP1 TP2 TP3 TP4

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SMSC USB3280 Bedienungsanleitung Seite 18