82595TX Datasheet, PDF (39/59 Pages) Intel Corporation – ISA/PCMCIA HIGH INTEGRATION ETHERNET CONTROLLER

82595TX
Table 11-2 Clock Timing
Symbol
Parameter
Min
Max
Unit
t1
X1 Cycle Time
49 995
50 005
ns
t2
X1 Fall Time
5
ns
t3
X1 Rise Time
5
ns
t4
X1 Low Time
15
ns
t5
X1 High Time
15
ns
11 4 ISA Interface Timing
Table 11-3 ISA 16-Bit I O Access
Parameter
Description
Min Max Units
Comments
T1a
BALE Active to Inactive
50
ns
T2a
BALE Active from Command Inactive 35
ns
T3a
AEN Valid to Falling Edge of BALE
20
ns Applies for Early IOCHRDY
T4a
AEN Valid to I O Command Active
100
ns
T5a
AEN Valid from I O Command Inactive 30
ns
T6a
SA Valid to Falling BALE
20
ns Applies for Early IOCHRDY
T7a
SA to CMD Active
63
ns
T8a
SA Valid Hold from CMD Inactive
42
ns
T9a
Valid SA to IOCS16 Active
100 ns
T10a
IOCS16 Valid Hold from Valid SA
0
ns
T11a
CMD Active to Inactive
125
ns
T12a
CMD Inactive to Active
92
ns Before I O Command
T13a
Active CMD to Valid IOCHRDY
18 ns
T14a
IOCHRDY Inactive Pulse
12 ms
T15a
CMD Active Hold from IOCHRDY Active 80
ns Applies to Ready Cycles
T16a
DATA Driven from READ CMD Active
0
ns
T17a
Valid READ Data from CMD Active
54 ns Applies to Standard Cycles Only
T18a
Valid READ Data from IOCHRDY Active
42 ns Applies to Ready Cycles Only
T19a
READ Data Hold from CMD Inactive
0
ns
T20a
READ CMD Inactive to Data Tristate
30 ns
T21a
CMD to WRITE Data Active
62 ns
T22a
WRITE Data Hold from CMD Inactive 25
ns
T23a
WRITE CMD Inactive to Data Tristate
30 ns
T24a
IOCHRDY Inactive to CMD Active
15
ns Applies to Early IOCHRDY
T25a
BALE Inactive to CMD Active
55
ns Applies to Early IOCHRDY
T26a
READ CMD Active to DIRx Active
34 ns
T27a
READ CMD Inactive to DIRx Inactive
15 ns
39