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 Tim ing Symbol Definitions
6.3.2.2 Timings
Test conditions: capacitive load on all pins = 50 pF.
TWHLH
TAVWL
TLLAX TWHQX
P2
P0
WR
ALE TLHLL TWLWH
A15:8
TAVLL TQVWH
D7:0
Data Out
TLLWL
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Q Data Out X No Longer Valid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