USB2.0 PHY IC
TP1 TP2
TP3
TP4
USB
Traces
Traces
Transceiver
A
Connector
B
Transceiver
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 1.3 (10-05-04)
SMSC GT3200, SMSC USB3250
DATA1S5HEET
SMSC [ SMSC CORPORATION ]
