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USB3290 数据表(PDF) 18 Page - SMSC Corporation |
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USB3290 数据表(HTML) 18 Page - SMSC Corporation |
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18 / 46 page ![]() Small Footprint Hi-Speed USB 2.0 Device PHY with UTMI Interface Datasheet Revision 1.5 (11-02-07) 18 SMSC USB3290 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 A Connector B TP1 TP2 TP3 TP4 |
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