ACK! dAck! 2.0 Manuel d'utilisateur télécharger pdf (Page 48)

Philips Semiconductors

ISP1581

USB 2.0 HS interface device

Objective speciﬁcation Rev. 02 — 23 October 2000 48 of 73

9397 750 07648

12.1.2 Template 2 (transmit waveform; device with captive cable)

The eye pattern in Figure 8 deﬁnes the transmit waveform requirements for a device

with a captive cable (measured at TP2). The corresponding signal levels and timings

are given in Table 78 . Timings are given as a percentage of the unit interval (UI),

which represents the nominal bit duration T

PERIOD

for a 480 Mbit/s transmission rate.

[1] In the unit interval following a transition.

[2] In all other cases.

Fig 8. Template 2 eye pattern (transmit waveform).

Table 78: Template 2 eye pattern deﬁnition

Name Differential voltage on DP, DM

(mV)

Relative duration

(% of unit interval)

Level 1 +525

[1]

+475

[2]

n.a.

Level 2 −525

[1]

−475

[2]

n.a.

Point 1 0 12.5

Point 2 0 87.5

Point 3 +175 35

Point 4 +175 65

Point 5 −175 35

Point 6 −175 65

004aaa002

level 1

level 2

point 3

point 4

point 2point 1

point 5

0 100relative duration

(% of unit interval)

−400 mV

+400 mV

−100

100

200

300

400

500

600

differential

output

voltage

(mV)

−200

−300

−400

−500

−600

point 6

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 72 73

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ACK! dAck! 2.0 Manuel d'utilisateur Page 48

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