com20020-5 Standard Microsystems Corp., com20020-5 Datasheet - Page 53

• Manufacturer Part Number: com20020-5
• Description: Com20020-5 Ulanc Universal Local Area Network Controller With 2k X 8 On-board Ram
• Manufacturer: Standard Microsystems Corp.

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