com90c66 Standard Microsystems Corp., com90c66 Datasheet - Page 55

• Manufacturer Part Number: com90c66
• Description: Arcnet Controller/transceiver With At Interface And On-chip Ram Corporation
• Manufacturer: Standard Microsystems Corp.

A0-A15
AEN
BALE
nIOW
nPROM **
IOCHRDY
* For latched addresses, t1 and t2 do not apply. Please refer to Figure 21 for Latched Address
** The external latch should use nPROM as nCS input and nIOW as CLK input.
t1
t2
t3
t4
t5
t6
t7
t8
t9
Mode.
nIOW High to BALE High (Next Address)
nIOW High to nPROM HIgh
Address Set Up to BALE Low *
Address Hold after BALE Low *
Address, AEN Set Up to nIOW Low
nIOW Low To nPROM Low
nIOW Low to IOCHRDY Low
IOCHRDY Low Pulse Width
AEN Hold after nIOW High
FIGURE 20 - WRITE EXTERNAL REGISTER CYCLE
t1
Parameter
t3
VALID
t4
t5
t2
55
t6
min
100
30
10
20
20
50
0
0
0
typ
max
165
t9
30
25
20
t7
t8
units
nS
nS
nS
nS
nS
nS
nS
nS
nS