10.15 MC68EC000 AC ELECTRICAL SPECIFICATIONS—BUS
ARBITRATION
Num
Characteristic
7
Clock High to Address, Data
Bus High Impedance
(Maximum)
16
Clock High to Control Bus High
Impedance
33
Clock High to BG Asserted
34
Clock High to BG Negated
35
BR Asserted to BG Asserted
36 7
BR Negated to BG Negated
38
BG Asserted to Control,
Address, Data Bus High
Impedance (AS Negated)
39
BG Width Negated
47
Asynchronous Input Setup
Time
58 1
BR Negated to AS , DS, R/ W
Driven
58A 1 BR Negated to FC Driven
NOTES: 1.The minimum value must be met to guarantee proper operation. If the maximum value is exceeded, BG may
be reasserted.
2.DS is used in this specification to indicate UDS and LDS .
10-28
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
Freescale Semiconductor, Inc.
(VCC=5.0VDC
5%; GND=0 VDC; T A = T L TO T H ; see Figure 10-14)
8 MHz
10 MHz
Min
Max
Min
—
55
—
—
55
—
—
35
—
—
35
—
1.5
3.5
1.5
1.5
3.5
1.5
—
55
—
1.5
—
1.5
5
—
5
1.5
—
1.5
1
—
1
For More Information On This Product,
Go to: www.freescale.com
12.5 MHz
16.67 MHz
Max
Min
Max
Min
55
—
55
—
55
—
55
—
35
—
35
0
35
—
35
0
3.5
1.5
3.5
1.5
3.5
1.5
3.5
1.5
55
—
55
—
—
1.5
—
1.5
—
5
—
5
—
1.5
—
1.5
—
1
—
1
20 MHz
Unit
Max
Min
Max
50
—
42
ns
50
—
42
ns
30
0
25
ns
30
0
25
ns
3.5
1.5
3.5
Clks
3.5
1.5
3.5
Clks
50
—
42
ns
—
1.5
—
Clks
—
5
—
ns
—
1.5
—
Clks
—
1
—
Clks
MOTOROLA