MC68EC000 Motorola, MC68EC000 Datasheet - Page 67

• Manufacturer Part Number: MC68EC000
• Description: Core Processor (SCM 68000)
• Manufacturer: Motorola

Bus Operation
3-26
UDSB and/or LDSB
SIZ1–SIZ0
FC2–FC0
BGACKB
DTACKB
D15–D0
A31–A0
TSCAE
ERWB
AOEB
COEB
DOEB
RMCB
RWB
DSB
BGB
BRB
ASB
CLKI
Figure 3-21. 3-Wire Bus Arbitration Timing Diagram—Special Case
BUS THREE-STATED
BGB ASSERTED
BRB VALID INTERNAL
BRB SAMPLED
BRB ASSERTED
S0
PROCESSOR
Freescale Semiconductor, Inc.
EC000 CORE PROCESSOR USER’S MANUAL
S2
For More Information On This Product,
S4
Go to: www.freescale.com
S6
BGACKB SAMPLED
BGACKB NEGATED
BUS RELEASED FROM THREE STATE AND
PROCESSOR STARTS NEXT BUS CYCLE
BGACKB NEGATED INTERNAL
ALTERNATE BUS MASTER
S0
S2
PROCESSOR
S4
MOTOROLA
S6
S0