82801DB Datasheet, PDF (544/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Electrical Characteristics
Figure 17-14. USB Jitter
T period
Differential
Data Lines
Crossover
Points
Jitter
Figure 17-15. USB EOP Width
Tperiod
Differential
Data Lines
Consecutive
Transitions
Paired
Transitions
Data
Crossover
Level
EOP
Width
Figure 17-16. SMBus Transaction
SMBCLK
t19
t20
t21
t131
t134
t135
t132
SMBDATA
t130
t133
t18
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Intel^® 82801DB ICH4 Datasheet