USB3280 SMSC Corporation, USB3280 Datasheet - Page 18

• Manufacturer Part Number: USB3280
• Description: Hi-Speed USB Device PHY
• Manufacturer: SMSC Corporation

Hi-Speed USB Device PHY with UTMI Interface
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.
TP1 TP2
TP3
TP4
USB Cable
Traces
Traces
Transceiver
A
B
Transceiver
Connector
Connector
Hub Circuit Board
Device Circuit Board
Figure 6.3 Eye Pattern Measurement Planes
Revision 1.2 (10-27-06)
18
SMSC USB3280
DATASHEET