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): 30/36頁
文件大?。?/td> 414K
代理商: UPD72012
30
Data Sheet S13918EJ3V0DS
μ
PD72012
(5) HUB EOP delay and EOP skew
50% point of
initial swing
V
SS
(b) Downstream EOP delay excluding cable
EOP delay:
t
EOPD
= t
EOPy
t
EHDDx
(t
EOPy
means apply this expression to t
EOP–
and t
EOP+
.)
EOP skew:
t
HESK
= t
EOP+
t
EOP–
The low speed timing below is determined by the same method.
t
LEOPD
, t
LHESK
Upstream
end of cable
Upstream port or
end of cable
(c) Downstream EOP delay with and without cable
Expansion
crossover points
Downstream
port
t
EOP-
t
EOP+
V
SS
t
EOP+
t
EOP-
Downstream
port of HUB
V
SS
t
EOP+
t
EOP-
Downstream
end of HUB
V
SS
(a) Downstream EOP delay including cable
Expansion
crossover points
Expansion
crossover points
Upstream port
of HUB
V
SS
V
SS
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