ISP1581BD datasheet(46/73 Pages) PHILIPS

46 / 73 page

Philips Semiconductors

ISP1581

USB 2.0 HS interface device

Objective speciﬁcation

Rev. 02 — 23 October 2000

46 of 73

9397 750 07648

12.1 High-speed signals

High-speed USB signals are characterized using eye patterns. For measuring the eye

patterns 4 test points have been deﬁned (see Figure 6). The

Universal Serial Bus

Speciﬁcation Rev. 2.0 deﬁnes the eye patterns in several ‘templates’. For ISP1581

Templates 1, 2, 3 and 4 are relevant.

TPERIOD is the bit duration corresponding with the USB data rate.

Fig 4.

Receiver differential data jitter.

MGR871

TPERIOD

tJR

differential

data lines

consecutive

transitions

× TPERIOD + tJR1

paired

transitions

× TPERIOD + tJR2

+3.3 V

0 V

tJR1

tJR2

Fig 5.

Receiver SE0 width tolerance.

MGR872

differential

data lines

+3.3 V

0 V

tFST

VIH(min)

Fig 6.

Eye pattern measurement planes.

MBL205

transceiver

hub circuit board

connector

traces

TP1

TP2

USB cable

transceiver

device circuit board

connector

traces

TP3

TP4

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