nTXEN
t4
t5
t2
t1
nPULSE1
LAST BIT
(200 nS BIT TIME)
t3
t2
t1
nPULSE2
RXIN
t6
t7
Parameter
min
typ
max units
50 *
*
0
nS
nS
nS
nS
nS
t1
t2
t3
t4
t5
nPULSE1, nPULSE2 Pulse Width
nPULSE1, nPULSE2 Period
nPULSE1, nPULSE2 Overlap
nTXEN Low to nPULSE1 Low**
200
+10
500
200
-10
400
100
Beginning of Last Bit Time to nTXEN High**
*
t6
t7
nS
nS
RXIN Pulse Width
RXIN Period
10
50
200 *
* t1 = 2 x (crystal period) for clock frequencies other than 40 MHz.
* t2,t7 = 8 x (crystal period) for clock frequencies other than 40 MHz.
This period applies to data of two consecutive one's.
** t4: For clock frequencies other than 40 MHz, t4 = 18 x (crystal period) ± 50 nsec.
** t5: For clock frequencies other than 40 MHz, t5 = 6 x (crystal period) ± 50 nsec.
FIGURE 14 - NORMAL MODE TRANSMIT OR RECEIVE TIMING
52
SMSC [ SMSC CORPORATION ]
