97CFDC Datasheet, PDF (16/20 Pages) SMSC Corporation – USB FLOPPY DISK CONTROLLER

USB AC PARAMETERS
Rise Time
C_L
Differential
Data Lines
10%
90%
C_L
tR
Fall Time
90%
10%
tF
Full Speed: 4 to 20ns at C_L = 50pF
FIGURE 7 - DATA SIGNAL RISE AND FALL TIME
T_PERIOD
Differential
Data Lines
Crossover
Points
Consecutive
Transitions
N * TPERIOD + TxJR1
Paired
Transitions
N * TPERIOD + TxJR2
FIGURE 8 - DIFFERENTIAL DATA JITTER
T_PERIOD
Differential
Data Lines
Crossover
Point
Crossover
Point Extended
Diff. Data to
SE0 Skew
N * TPERIOD + TDEOP
Source EOP Width: TEOPT
Receiver EOP Width: TEOPR1, TEOPR2
FIGURE 9 - DIFFERENTIAL TO EOP TRANSITION SKEW AND EOP WIDTH
T_PERIOD
Differential
Data Lines
T_JR
T_JR1
T_JR2
Consecutive
Transitions
N * T_PERIOD + T_JR1
Paired
Transitions
N * T_PERIOD + T_JR2
FIGURE 10 - RECEIVER JITTER TOLERANCE
SMSC DS – USB97CFDC
Page 16
Rev. 12/15/2000