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9-10
Electrical Characteristics
9.4.2 External Data Read Cycle
Figure 9.6
External Data Read Waveforms
Table 9.15
External Data Read Timings
Symbol
Parameter
Min
Max
Units
t
8
ALE to RD/ = Minimum delay from ALE falling to RD/ falling
50
–
ns
t
9
RD/ pulse width = Minimum time RD/ is low
50
–
ns
t
10
RD/ to valid data in = Maximum delay from RD/ falling to data valid
–
48
ns
t
11
Data hold after RD/
0
–
ns
t
12
Data float after RD/
–
5
ns
t
6
Address Valid to ALE Falling = Minimum setup time for A[15:8] and
AD[7:0] to ALE falling
20
–
ns
t
7
ALE Falling to Lower Address Valid = Maximum delay from ALE
falling to A[7:0] valid
–
10
–
ALE
PSEN/
RD/
AD[7:0]
A[7:0]
t
10
t
9
ADDR
ADDR
ADDR
A[15:8]
t
11
t
8
t
6
t
7
ADDR
ADDR
t
12
DATA IN
ADDR
Содержание Symbios SYM53C040
Страница 12: ...xii Preface...
Страница 90: ...4 18 SCSI and DMA Registers...
Страница 98: ...5 8 SFF 8067 Registers...
Страница 110: ...6 12 Two Wire Serial Registers...
Страница 126: ...7 16 Miscellaneous Registers...
Страница 160: ...8 34 System Registers...
Страница 184: ...9 24 Electrical Characteristics...
Страница 194: ...A 10 Register Summary...
Страница 214: ......