Datasheet

222
4341H–MP3–10/07
AT8xC51SND2C/MP3B
24.3.2.3 Waveforms
Figure 24-15. External Data 8-bit Bus Cycle - Read Waveforms
Figure 24-16. External Data 8-bit Bus Cycle - Write Waveforms
24.3.3 External IDE 16-bit Bus Cycles
24.3.3.1 Definition of Symbols
Table 24-14. External IDE 16-bit Bus Cycles Timing Symbol Definitions
T
AVDV
T
LLAX
T
RHDX
T
RHDZ
T
AVLL
T
AVRL
P2
P0
RD
ALE
T
LHLL
T
RLRH
Data In
A15:8
T
RLAZ
T
LLRL
T
RHLH
T
RLDV
D7:0A7:0
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Q Data Out X No Longer Valid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