8.0 MC68SEC000 AC ELECTRICAL SPECIFICATIONS — BUS
ARBITRATION
Add the following table and Figure 11 to Section 10.17.
(GND = 0 Vdc; TA = TL to TH; refer to Figure 13)
NUM
CHARACTERISTICp
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
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
581
BR Negated to AS, LDS, UDS, R/W Driven
58A1
BR Negated to FC Driven
10MHz
MIN MAX
—
55
—
55
0
35
0
35
1.5 3.5
1.5 3.5
—
55
1.5 —
5
—
1.5 —
1
—
16MHz
MIN MAX
—
50
—
50
0
30
0
30
1.5 3.5
1.5 3.5
—
50
1.5 —
5
—
1.5 —
1
—
20MHz
UNIT
MIN MAX
—
42
ns
—
42
ns
0
25
ns
0
25
ns
1.5 3.5 Clks
1.5 3.5 Clks
—
42
ns
1.5 — Clks
5
—
ns
1.5 — Clks
1
— Clks
Applies to 3.3V and 5V.
1. The minimum value must be met to guarantee proper operation. If the maximum value is exceeded, BG may be reasserted.
16
M68000 USER’S MANUAL ADDENDUM
MOTOROLA