參數(shù)資料
型號： UPD72012
廠商： NEC Corp.
英文描述： HUB CONTROLLER FOR UNIVERSAL SERIAL BUS
中文描述： 集線器控制器通用串行總線
文件頁數(shù)： 29/36頁
文件大小： 414K
代理商： UPD72012
Data Sheet S13918EJ3V0DS
29
μ
PD72012
(4) HUB differential delay, differential jitter, and SOP distortion
50% point of
initial swing
V
SS
Downstream
port of HUB
Upstream
end of cable
V
SS
(b) Downstream HUB delay excluding cable
HUB operation jitter:
t
HDJ1
= t
HDDx
(J)
t
HDDx
(K) or t
HDDx
(K)
t
HDDx
(J) Continuous transition
t
HDJ2
= t
HDDx
(J)
t
HDDx
(J) or t
HDDx
(K)
t
HDDx
(K) Pair transition
Bit after SOP width distortion (same as data jitter of next transition of SOP):
t
FSOP
= t
HDDx
(next J)
t
HDDx
(SOP)
The low-speed timing below is determined by the same method.
t
LHDD
, t
LDHJ1
, t
LDJH2
, t
LUHJ1
, t
LUJH2
, and t
LSOP
(a) Downstream HUB delay including cable
Downstream
end of HUB
HUB delay
downstream
t
HDD1
Crossover point
50% point of
initial swing
HUB delay
downstream
t
HDD2
Upstream
port of HUB
Crossover point
V
SS
Downstream
port of HUB
V
SS
(c) Upstream HUB delay with and without cable
Upstream port or
end of cable
HUB delay
upstream
t
HDD1
, t
HDD2
Crossover point
V
SS
V
SS
相關PDF資料
PDF描述
UPD72012GB-003-3B4 HUB CONTROLLER FOR UNIVERSAL SERIAL BUS
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