nTXEN
t1
t3
t2
t9
nPULSE1
t8
LAST BIT
(200 nS BIT TIME)
t4
nPULSE2
t5
t6
(Internal Clk)
t7
t10
RXIN
t11
Parameter
min
typ max units
0
25
t1
t2
t3
t4
t5
t6
t7
t8
nS
nPULSE2 High to nTXEN Low
nPULSE1 Pulse Width
nPULSE1 Period
nPULSE2 Low to nPULSE1 Low
nPULSE2 High Time
nPULSE2 Low Time
nPULSE2 Period
nPULSE2 High to nTXEN High
100*
200*
nS
nS
nS
nS
nS
nS
nS
0
25
50*
50*
100*
25
0
(First rising edge on nPULSE2 after Last Bit Time)
nTXEN Low to first nPULSE1 Low**
300
10
400
t9
nS
t10
t11
RXIN Pulse Width
RXIN Period
100*
200*
nS
nS
* t5,t6 = 2 x (crystal period) for clock frequencies other than 40 MHz.
* t2,t7,t10 = 4 x (crystal period) for clock frequencies other than 40 MHz.
* t3,t11 = 8 x (crystal period) for clock frequencies other than 40 MHz.
This period applies to data of two consecutive one's.
** t9: For clock frequencies other than 40 MHz, t9 = 14 x (clock period) ± 50 nsec.
FIGURE 15 - BACKPLANE MODE TRANSMIT OR RECEIVE TIMING
(These signals are to and from the differential driver or the cable)
53
SMSC [ SMSC CORPORATION ]
