USB3290 Datasheet, PDF (19/43 Pages) SMSC Corporation – Small Footprint Hi-Speed USB 2.0 Device PHY with UTMI Interface

Small Footprint Hi-Speed USB 2.0 Device PHY with UTMI Interface
Datasheet
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 below. Time is specified as a percentage of the unit interval
(UI), which represents the nominal bit duration for a 480 Mbit/s transmission rate.
Level 1
Point 3
Point 4
400mV
Differential
Point 1
Point 2
0 Volts
Differential
Level 2
0%
Point 5
Point 6
Unit Interval
-400mV
Differential
100%
Figure 6.4 Eye Pattern for Transmit Waveform and Eye Pattern Definition
Level 1
Level 2
Point 1
Point 2
Point 3
Point 4
Point 5
Point 6
VOLTAGE LEVEL (D+, D-)
525mV in UI following a transition,
475mV in all others
-525mV in UI following a transition,
-475mV in all others
0V
0V
300mV
300mV
-300mV
-300mV
TIME (% OF UNIT INTERVAL)
N/A
N/A
7.5% UI
92.5% UI
37.5% UI
62.5% UI
37.5% UI
62.5% UI
SMSC USB3290
19
DATASHEET
Revision 1.2 (10-27-06)