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UPD72012 Scheda tecnica(PDF) 30 Page - NEC

Il numero della parte UPD72012
Spiegazioni elettronici  HUB CONTROLLER FOR UNIVERSAL SERIAL BUS
PDF  36 Pages
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Produttore elettronici  NEC [NEC]
Homepage  http://www.nec.com/
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UPD72012 Scheda tecnica(HTML) 30 Page - NEC

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Data Sheet S13918EJ3V0DS
µPD72012
(5) HUB EOP delay and EOP skew
50% point of
initial swing
VSS
(b) Downstream EOP delay excluding cable
EOP delay:
tEOPD = tEOPy
− tEHDDx
(tEOPy means apply this expression to tEOP– and tEOP+.)
EOP skew:
tHESK = tEOP+
− tEOP–
The low speed timing below is determined by the same method.
tLEOPD, tLHESK
Upstream
end of cable
Upstream port or
end of cable
(c) Downstream EOP delay with and without cable
Expansion
crossover points
Downstream
port
tEOP-
tEOP+
VSS
tEOP+
tEOP-
Downstream
port of HUB
VSS
tEOP+
tEOP-
Downstream
end of HUB
VSS
(a) Downstream EOP delay including cable
Expansion
crossover points
Expansion
crossover points
Upstream port
of HUB
VSS
VSS



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