USB3250 datasheet(21/48 Pages) SMSC

21 / 48 page

USB2.0 PHY IC

Datasheet

SMSC GT3200, SMSC USB3250

Revision 1.5 (03-24-06)

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 Table 6.7. Timings are given as

a percentage of the unit interval (UI), which represents the nominal bit duration for a 480 Mbit/s

transmission rate.

Figure 6.4 Eye Pattern for Transmit Waveform and Eye Pattern Definition

Table 6.6 Eye Pattern for Transmit Waveform and Eye Pattern Definition

VOLTAGE LEVEL (D+, D-)

TIME

(% OF UNIT INTERVAL)

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

7.5% UI

Point 2

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

Vlt

Differential

-400mV

Differential

400mV

Unit Interval

100%

Level 2

Level 1

Point 1

Point 2

Point 4

Point 3

Point 6

Point 5

USB3250 数据表(PDF) 21 Page - SMSC Corporation

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