STPCI2 查看數據表（PDF） - STMicroelectronics
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STPCI2 Datasheet PDF : 108 Pages
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STPC® ATLAS
4.5.6 ISA INTERFACE AC TIMING CHARACTERISTICS
Figure 4-8 and Table 4-14 list the AC characteris-
tics of the ISA interface.
Figure 4-8. ISA Cycle (ref Table 4-14.)
2
15
38
37
14
13
12
25
9
18
ALE
56
29
AEN
22
Valid AENx
34
33
3
LA [23:17]
t(s) SA [19:0]
Produc CONTROL (Note 1)
te IOCS16#
le MCS16#
so IOCHRDY
b READ DATA
O WRITE DATA
Valid Address
42
11
24
41
10
Valid Address, SBHE*
57
27
23
48
47
61
26
55
58
59
28
64
VALID DATA
54
V.Data
t(s) - Note 1: Stands for SMEMR#, SMEMW#, MEMR#, MEMW#, IOR# & IOW#.
uc The clock has not been represented as it is dependent on the ISA Slave mode.
rod Table 4-14. ISA Bus AC Timing
te P Name Parameter
Min
le 2
LA[23:17] valid before ALE# negated
5T
o3
LA[23:17] valid before MEMR#, MEMW# asserted
s 3a Memory access to 16-bit ISA Slave
5T
Ob 3b Memory access to 8-bit ISA Slave
5T
Max
Units
Cycles
Cycles
Cycles
9
SA[19:0] & SBHE valid before ALE# negated
1T
Cycles
10
SA[19:0] & SBHE valid before MEMR#, MEMW# asserted
10a Memory access to 16-bit ISA Slave
2T
Cycles
10b Memory access to 8-bit ISA Slave
2T
10
SA[19:0] & SHBE valid before SMEMR#, SMEMW# asserted
Cycles
Note: The signal numbering refers to Figure 4-8
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