Philips Universal Serial Bus ISP1122 - Manual (Page 35)

Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 35 of 48
9397 750 07002 © Philips Electronics N.V. 2000. All rights reserved.
T
PERIOD
is the bit duration corresponding with the USB data rate.
Fig 15. Source differential data jitter.
handbook, full pagewidth
MGR870
TPERIOD
differential
data lines
crossover point crossover point crossover point
consecutive
transitions
N × TPERIOD + tDJ1
paired
transitions
N × TPERIOD + tDJ2
+ 3.3 V
0 V
T
PERIOD
is the bit duration corresponding with the USB data rate.
Full-speed timing symbols have a subscript prefix ‘F’, low-speed timings a prefix ‘L’.
Fig 16. Source differential data-to-EOP transition skew and EOP width.
handbook, full pagewidth
MGR776
TPERIOD
differential
data lines
crossover point
differential data to
SE0/EOP skew
N
×
TPERIOD
+
tDEOP
source EOP width: tEOPT
receiver EOP width: tEOPR
crossover point
extended
+
3.3 V
0 V
T
PERIOD
is the bit duration corresponding with the USB data rate.
Fig 17. Receiver differential data jitter.
handbook, full pagewidth
MGR871
TPERIOD
tJR
differential
data lines
consecutive
transitions
N × TPERIOD + tJR1
paired
transitions
N × TPERIOD + tJR2
+ 3.3 V
0 V
tJR1 tJR2