USB3250 Standard Microsystems Corporation, USB3250 Datasheet - Page 20

• Manufacturer Part Number: USB3250
• Description: Usb2.0 PHY IC
• Manufacturer: Standard Microsystems Corporation

USB2.0 PHY IC
Datasheet
TP1 TP2
TP3
TP4
USB
Traces
Traces
Transceiver
A
B
Transceiver
Connector
Connector
Hub Circuit Board
Device Circuit Board
Figure 6.3 Eye Pattern Measurement Planes
The eye pattern in
Figure 6.4
defines the transmit waveform requirements for a hub (measured at TP2
of
Figure
6.3) or a device without a captive cable (measured at TP3 of
Figure
6.3). The corresponding
signal levels and timings are given in
Table
6.6. Time is specified as a percentage of the unit interval
(UI), which represents the nominal bit duration for a 480 Mbit/s transmission rate.
Revision 1.5 (03-24-06)
20
SMSC GT3200, SMSC USB3250
DATASHEET