Philips Universal Serial Bus ISP1122 - Manual (Page 36)

Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 36 of 48
9397 750 07002 © Philips Electronics N.V. 2000. All rights reserved.
Fig 18. Receiver SE0 width tolerance.
handbook, halfpage
MGR872
differential
data lines
+ 3.3 V
0 V
tFST
VIH(min)
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timings a prefix ‘L’.
Fig 19. Hub differential data delay and SOP distortion.
handbook, full pagewidth
MGR777
SOP distortion:
tSOP = tHDD (next J)
− tHDD(SOP)
(A) downstream hub delay (B) upstream hub delay
upstream
differential
data lines
hub delay
downstream
tHDD
hub delay
upstream
tHDD
downstream
differential
data lines
downstream
differential
data
upstream
differential
data
crossover
point
crossover
point
crossover
point
crossover
point
+ 3.3 V
0 V
+ 3.3 V
0 V