2 external ide 16-bit bus cycles, 1 definition of symbols, 2 timings – Atmel AT89C5132 User Manual
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4173ES–USB–09/07
AT89C5132
Figure 6-9.
External 8-bit Bus Cycle – Data Write Waveforms
6.3.2
External IDE 16-bit Bus Cycles
6.3.2.1
Definition of Symbols
Table 9. External IDE 16-bit Bus Cycles Timing Symbol Definitions
6.3.2.2
Timings
Test conditions: capacitive load on all pins = 50 pF.
T
WHLH
T
AVWL
T
LLAX
T
WHQX
P2
P0
WR
ALE
T
LHLL
T
WLWH
A15:8
T
AVLL
T
QVWH
D7:0
Data Out
T
LLWL
A7:0
Signals
Conditions
A
Address
H
High
D
Data In
L
Low
L
ALE
V
Valid
Q
Data Out
X
No Longer Valid
R
RD
Z
Floating
W
WR