MC68EC000 Motorola, MC68EC000 Datasheet - Page 64

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

MOTOROLA
G = Bus Grant
R = Bus Request Internal
A = Bus Grant Acknowledge Internal
T = Three-State Control to Bus Control Logic
X = Don't Care
Figure 3-18. Bus Arbitration Unit State Diagrams
RA
XX
Freescale Semiconductor, Inc.
EC000 CORE PROCESSOR USER’S MANUAL
For More Information On This Product,
GT
GT
X
(a) 3-Wire Bus Arbitration
(b) 2-Wire Bus Arbitration
RA
GT
R
XA
RA
Go to: www.freescale.com
RA
GT
1
RA
R
GT
GT
GT
RA
RA
RA
RA
R
RA
R+A
XA
GT
XX
1
R
GT
GT
NOTES:
RX
1. State machine will not change if
2. The address bus will be placed in
3.3 BUS ARBITRATION CONTROL
the bus is S0 or S1. Refer to
the high-impedance state if T is
asserted and ASB is negated.
RA
Bus Operation
3-23