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

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UPD72012

HUB CONTROLLER FOR UNIVERSAL SERIAL BUS

NEC => Renesas Technology 

Measurement Conditions

(1) Differential data jitter

tPERIOD

Differential data lines

Crossover

points

µPD72012

Continuous

transition

N × tPERIOD + txJR1

Pair transition

N × tPERIOD + txDJ2

(2) EOP transition skew and EOP length differential

tPERIOD

Differential data lines

Crossover point

Extension

crossover points

From differential

data until SE0 skew

N × tPERIOD + tDEOP

(3) Permissible range of receiver jitter

tPERIOD

Differential data lines

Source EOP width: tFEOPT, tLEOPT

Receiver EOP width: tFEOPR, tLEOPR

tJR

tJR1

tJR2

Continuous transition

N × tPERIOD + tJR1

Pair transition

N × tPERIOD + tJR2

Remark tPERIOD is the data rate of a receiver that has the range that is defined in paragraph 7.1.11 of USB

Specification Revision 1.1.

28

Data Sheet S13918EJ3V0DS

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