16
M68000 USER’S MANUAL ADDENDUM
MOTOROLA
8.0 MC68SEC000 AC ELECTRICAL SPECIFICATIONS — BUS
ARBITRATION
Add the following table and Figure 11 to Section 10.17.
(GND = 0 Vdc; T
A
= T
L
to T
H
; refer to Figure 13)
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.
NUM CHARACTERISTICp
10MHz 16MHz 20MHz
UNIT
MIN MAX MIN MAX MIN MAX
7 Clock High to Address, Data Bus High Impedance (Maximum) — 55 — 50 — 42 ns
16 Clock High to Control Bus High Impedance — 55 — 50 — 42 ns
33 Clock High to BG
Asserted 0 35 0 30 0 25 ns
34 Clock High to BG
Negated 0 35 0 30 0 25 ns
35 BR
Asserted to BG Asserted 1.5 3.5 1.5 3.5 1.5 3.5 Clks
36 BR
Negated to BG Negated 1.5 3.5 1.5 3.5 1.5 3.5 Clks
38 BG
Asserted to Control, Address, Data Bus High Impedance (AS
Negated)
—55—50—42ns
39 BG
Width Negated 1.5 — 1.5 — 1.5 — Clks
47 Asynchronous Input Setup Time 5—5—5—ns
58
1
BR
Negated to AS, LDS, UDS, R/W Driven 1.5 — 1.5 — 1.5 — Clks
58A
1
BR
Negated to FC Driven 1—1—1—Clks
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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