com90c66 Standard Microsystems Corp., com90c66 Datasheet - Page 52

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

AEN
A0-A15,
nSBHE
BALE
nIOR
D0-D7
D0-D15
nTOPH,
nTOPL
nIOCS16
* For latched addresses, t1 and t2 do not apply. Please refer to Figure 21 for Latched Address
** 130 nS minimum inactive time on consecutive reads from Data Register of the COM90C66.
Mode.
t1
t2
t3
t4
t5
t6
t7
t8
t9
t10
or
Address, nSBHE Set Up to BALE Low *
Address, nSBHE Hold after BALE Low *
nIOR Low to Valid Data
A2-A15 Valid, AEN Low, BALE High to nIOCS16 Low
Address, nSBHE, AEN Set Up to nIOR Low
nIOR Low to nTOPH, nTOPL Low
nIOR High to nTOPH, nTOPL High
nIOR High to Data High Impedance
nIOR High to BALE High (Next Address)
AEN Hold after nIOR High
t6
t1
Parameter
t3
FIGURE 17 - READ I/O CYCLE
VALID
t2
t5
52
t4
min
20
20
25
30
10
0
0
0
0
VALID DATA
typ
t7
t10
t8
t9
max
80
30
25
15
20
**
units
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS