ISP1521 datasheet(41/53 Pages) PHILIPS

41 / 53 page

Philips Semiconductors

ISP1521

Hi-Speed USB hub controller

Product data

Rev. 03 — 24 November 2004

41 of 53

9397 750 13702

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

Full-speed timing symbols have a subscript preﬁx ‘F’, low-speed timing a preﬁx ‘L’.

Fig 11. Source differential data-to-EOP transition skew and EOP width.

mgr776

TPERIOD

differential

data lines

crossover point

differential data to

SE0/EOP skew

× TPERIOD + tDEOP

source EOP width: tEOPT

receiver EOP width: tEOPR

crossover point

extended

+3.3 V

0 V

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

tJR is the jitter reference point.

Fig 12. Receiver differential data jitter.

mgr871

TPERIOD

tJR

differential

data lines

+3.3 V

0 V

tJR1

tJR2

consecutive

transitions

× TPERIOD + tJR1

paired

transitions

× TPERIOD + tJR2

Fig 13. Receiver SE0 width tolerance.

mgr872

differential

data lines

+3.3 V

0 V

tFST

VIH(min)

ISP1521 Datasheet(PDF) 41 Page - NXP Semiconductors

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