SMSC USB3280 Manual De Usuario

Hi-Speed USB Device PHY with UTMI Interface

SMSC USB3280

19

Revision 1.5 (11-15-07)

 

The eye pattern in 

 defines the transmit waveform requirements for a hub (measured at TP2

of 

) or a device without a captive cable (measured at TP3 of 

).  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

525mV in UI following a transition,
475mV in all others

N/A

Level 2

-525mV in UI following a transition,
-475mV in all others

N/A

Point 1

0V

7.5% UI

Point 2

0V

92.5% UI

Point 3

300mV

37.5% UI

Point 4

300mV

62.5% UI

Point 5

-300mV

37.5% UI

Point 6

-300mV

62.5% UI

Differential 

-400mV 

Differential 

400mV 

Level 2 

Level 1 

Point 1 

Point 2 

Point 4 

Point 3 

Point 6 

Point 5 

   0 Volts 
Differential