Motorola MC68020 - MC68020;EC020 Block Diagram

MOTOROLA M68020 USER’S MANUAL 1- 3
SEQUENCER AND CONTROL
CONTROL
STORE
CONTROL
LOGIC
INSTRUCTION
CACHE
STAGE
B
STAGE
C
STAGE
D
CACHE
HOLDING
R
EGISTE
R
(CAHR)
INTERNAL
D
ATA
B
US
INSTRUCTION PIPE
INSTRUCTION
ADDRES
S
BU
S
ADDRESS
SECTION
PROGRAM
COUNTE
R
SECTION
DATA
S
ECTIO
N
EXECUTION UNIT
MISALIGNMENT
MULTIPLEXER
SIZE
M
ULTIPLEXE
R
WRITE PENDING
BUFFER
PREFETCH PENDING
BUFFER
MICROBUS
CONTROL LOGIC
BUS CONTROLLER
BUS CONTROL
SIGNALS
ADDRESS
BU
S
ADDRESS
PADS
DATA
PADS
DATA
BUS
3
2-BI
T
ADDRESS
BUS
3
2-BI
T
*
*
24-Bit for MC68EC020
Figure 1-1. MC68020/EC020 Block Diagram