UPD72012 Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD72012

HUB CONTROLLER FOR UNIVERSAL SERIAL BUS

NEC => Renesas Technology 

µPD72012

(5) HUB EOP delay and EOP skew

(a) Downstream EOP delay including cable

Upstream

end of cable

50% point of

initial swing

VSS

tEOP-

Downstream

port of HUB

tEOP+

VSS

(b) Downstream EOP delay excluding cable

Upstream port

of HUB

VSS

Downstream

end of HUB

VSS

Expansion

crossover points

tEOP-

tEOP+

(c) Downstream EOP delay with and without cable

Downstream

port

VSS

Upstream port or

end of cable

VSS

Expansion

crossover points

tEOP-

tEOP+

Expansion

crossover points

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

30

Data Sheet S13918EJ3V0DS

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