isp1520 NXP Semiconductors, isp1520 Datasheet - Page 38

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isp1520

Manufacturer Part Number
isp1520
Description
Hi-speed Universal Serial Bus Hub Controller
Manufacturer
NXP Semiconductors
Datasheet

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Philips Semiconductors
ISP1520_4
Product data sheet
Fig 12. Receiver differential data jitter
Fig 14. Hub differential data delay and SOP distortion
differential
data lines
T
t
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timing a prefix ‘L’.
JR
PERIOD
3.3 V
SOP distortion:
t
is the jitter reference point.
3.3 V
3.3 V
downstream
SOP
0 V
differential
differential
data lines
data lines
upstream
0 V
0 V
= t
is the bit duration corresponding to the USB data rate.
HDD (next J)
T
PERIOD
(A) downstream hub delay
Fig 13. Receiver SE0 width tolerance
t
HDD(SOP)
crossover
downstream
hub delay
point
t
HDD
t
JR
N
consecutive
T
transitions
PERIOD
t
Rev. 04 — 28 April 2006
JR1
crossover
differential
data lines
N
point
3.3 V
T
transitions
0 V
PERIOD
paired
downstream
t
differential
differential
JR2
upstream
data
data
t
JR1
(B) upstream hub delay
crossover
hub delay
upstream
t
point
FST
t
HDD
V
IH(min)
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Hi-Speed USB hub controller
mgr872
t
JR2
ISP1520
crossover
mgr777
point
mgr871
38 of 53

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