isp1521 NXP Semiconductors, isp1521 Datasheet - Page 41

• Manufacturer Part Number: isp1521
• Description: Hi-speed Universal Serial Bus Hub Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
ISP1521_4
Product data sheet
Fig 14. Hub differential data delay and SOP distortion
Fig 15. Hub EOP delay and EOP skew
3.3 V
3.3 V
downstream
differential
differential
data lines
0 V
data lines
0 V
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timing a prefix ‘L’.
upstream
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timing a prefix ‘L’.
EOP delay:
EOP delay relative to t
EOP skew:
SOP distortion:
t
t
t
t
3.3 V
3.3 V
downstream
SOP
EOP
EOPD
HESK
differential
differential
data lines
data lines
upstream
0 V
0 V
= t
= max (t
= t
= t
HDD (next J)
EOP+
EOP
(A) downstream hub delay
EOP
(A) downstream EOP delay
t
HDD
t
EOP
, t
HDD
EOP+
t
HDD(SOP)
crossover
downstream
t
:
EOP
hub delay
point
)
t
HDD
t
EOP+
crossover
extended
Rev. 04 — 30 March 2006
point
crossover
extended
crossover
point
point
downstream
end of cable
downstream
differential
differential
upstream
upstream
port
data
data
(B) upstream hub delay
(B) upstream EOP delay
crossover
hub delay
upstream
point
t
HDD
t
EOP
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Hi-Speed USB hub controller
t
EOP+
crossover
extended
ISP1521
crossover
point
mgr777
point
crossover
extended
mgr778
point
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