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21
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Q Data Out X No Longer Valid
RRD
ZFloating
WWR