MC68030 Datasheet, PDF (164/602 Pages) Motorola, Inc – ENHANCED 32-BIT MICROPROCESSOR

Bus Operation
31
OP0
LONG WORD OPERAND (REGISTER)
OP1
OP2
OP3
31
PR
31
OP3
0
CACHE ENTRIES
OP0
OP1
N
N1
DATA BUS
D31
D16
0
OP2
0
N2
WORD MEMORY
MSB
LSB
PR
OP0
OP1
OP2
OP3
N
N1
N2
MC68EC030
SIZ1 SIZ0 A1 A0
0
0
0
0
1
1
0
1
0
1
1
0
1
0
1
1
MEMORY CONTROL
A0 DSACK1 DSACK0
1
L
H
0
L
H
0
L
H
0
L
H
Figure 7-11. Misaligned Cachable Long-Word Transfer from Word Port Example
15
WORD OPERAND
0
OP2
OP3
D31
DATA BUS
D16
WORD MEMORY
MSB
LSB
XXX
OP2
OP3
XXX
MC68030
SIZ1 SIZ0 A2 A1 A0
1 0001
0 1010
MEMORY CONTROL
DSACK1 DSACK0
L
H
L
H
Figure 7-12. Misaligned Word Transfer to Word Port Example
MOTOROLA
MC68030 USER’S MANUAL
7-17