MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 304

• Manufacturer Part Number: MC68000
• Manufacturer: MOTOROLA [Motorola, Inc]

Electrical Characteristics
6.10 AC ELECTRICAL SPECIFICATIONS—EXTERNAL MASTER
6-16
NOTE: If AS is negated before DS, the data bus could be three-stated (spec 126) before DS is negated.
Num.
108A
109A
100
101
102
103
104
105
106
107
108
INTERNAL ASYNCHRONOUS READ/WRITE CYCLES
(see Figure 6-8 and Figure 6-9)
R/W Valid to DS Low
DS Low to Data-In Valid
DTACK Low to Data-In Hold Time
AS Valid to DS Low
DTACK Low to AS, DS High
DS High to DTACK High
DS Inactive to AS Inactive
DS High to R/W High
DS High to Data High Impedance
DS High to Data-Out Hold Time (see Note)
Data Out Valid to DTACK Low
Characteristic
MC68302 USER’S MANUAL
t
Symbol
t
t
t
t
t
DSHRWH
RWVDSL
t
DSHDKH
t
t
DKLDSH
t
DOVDKL
ASVDSL
t
DSLDIV
DSHDH
DKLDH
DSHDZ
DSIASI
16.67 MHz
Min
15
—
—
—
0
0
0
0
0
0
0
Max
30
45
45
—
—
—
—
—
—
—
—
Min
—
—
—
15
0
0
0
0
0
0
0
20 MHz
Max
25
40
40
—
—
—
—
—
—
—
—
Min
—
—
—
10
0
0
0
0
0
0
0
25 MHz
Max
20
30
30
—
—
—
—
—
—
—
—
MOTOROLA
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns