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Specification
NET2272 USB Peripheral Controller
______________________________________________________________________________
NetChip Technology, Inc., 2003
Patent Pending
335 Pioneer Way, Mountain View, California 94041
TEL (650) 526-1490
FAX (650) 526-1494
http://www.netchip.com
Rev 1.2, October 15, 2003
89
10.4.3 USB Full Speed Port AC Waveforms
Differential
Data Lines
90%
10%
90%
10%
Rise Time
Fall Time
t
R
t
F
C
L
C
L
Full Speed: 4 to 20ns at C
L = 50pF
Figure 10-1. Data Signal Rise and Fall Time
Crossover
Points
T
PERIOD
Differential
Data Lines
Consecutive
Transitions
N*T
PERIOD+TxJR1
Paired
Transitions
N*T
PERIOD+TxJR2
Figure 10-2. Differential Data Jitter
Crossover
Point
T
PERIOD
Differential
Data Lines
Diff. Data to
SE0 Skew
N*T
PERIOD+TFDEOP
Crossover
Point Extended
Source EOP Width: T
FEOPT
Receiver EOP Width: T
FEOPR
Figure 10-3. Differential to EOP Transition Skew and EOP Width
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