USB3280 SMSC Corporation, USB3280 Datasheet - Page 19

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

Hi-Speed USB Device PHY with UTMI Interface
Datasheet
SMSC USB3280
Level 1
Level 2
Point 1
Point 2
Point 3
Point 4
Point 5
Point 6
The eye pattern in
of
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.
Figure
Figure 6.4 Eye Pattern for Transmit Waveform and Eye Pattern Definition
6.3) or a device without a captive cable (measured at TP3 of
Level 1
Level 2
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
Figure 6.4
0%
VOLTAGE LEVEL (D+, D-)
Point 1
defines the transmit waveform requirements for a hub (measured at TP2
DATASHEET
Point 5
Point 3
Unit Interval
19
Point 4
Point 6
Point 2
N/A
N/A
7.5% UI
92.5% UI
37.5% UI
62.5% UI
37.5% UI
62.5% UI
100%
TIME (% OF UNIT INTERVAL)
Figure
Differential
Differential
400mV
Differential
-400mV
0 Volts
6.3). The corresponding
Revision 1.2 (10-27-06)