USB3280 Datasheet, PDF (20/42 Pages) SMSC Corporation – Hi-Speed USB Device PHY with UTMI Interface

Hi-Speed USB Device PHY with UTMI Interface
Datasheet
The eye pattern in Figure 6.5 defines the receiver sensitivity requirements for a hub (signal applied at
test point TP2 of Figure 6.3) or a device without a captive cable (signal applied at test point TP3 of
Figure 6.3). The corresponding signal levels and timings are given in the table below. Timings are
given 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 5
Point 2
Point 6
0 Voltｓ
Differential
Level 2
0%
-400mV
Differential
100%
Figure 6.5 Eye Pattern for Receive Waveform and Eye Pattern Definition
Level 1
Level 2
Point 1
Point 2
Point 3
Point 4
Point 5
Point 6
575mV
-575mV
0V
0V
150mV
150mV
-150mV
-150mV
VOLTAGE LEVEL (D+, D-)
TIME (% OF UNIT INTERVAL)
N/A
N/A
15% UI
85% UI
35% UI
65% UI
35% UI
65% UI
Revision 1.2 (10-27-06)
20
DATASHEET
SMSC USB3280