A0
A5
A5
A2
A3
A0
CLKOUT
A0–A23
D0–D15
AS
47A
47A
BR
35
37
BG
33
47A
33
BGACK
68300 BUS ARB TIM IDLE
A
Figure A-9 Bus Arbitration Timing Diagram — Idle Bus Case
S0
S41
S42
S43
8
S0
S1
S2
CLKOUT
A0–A23
R/W
6
18
20
AS
12
9
15
DS
71
70
72
D0–D15
BKPT
73
74
START OF
EXTERNAL CYCLE
SHOW CYCLE
68300 SHW CYC TIM
NOTE: Show cycles can stretch during S42 when bus accesses take longer than two cycles due to wait-state insertion
by IMB modules.
Figure A-10 Show Cycle Timing Diagram
MOTOROLA
A-18
ELECTRICAL CHARACTERISTICS
MC68331
USER’S MANUAL
MOTOROLA [ MOTOROLA ]
