Motorola MC68020 - Byte Enable Signal Generation for 16- and 32-Bit Ports

MOTOROLA M68020 USER’S MANUAL 5- 23
A1
SIZ0
SIZ1
R/W
LD
UD
LLD
LMD
UMD
UUD
A0
UUD
U
MD
L
MD
L
LD
U
D
L
D
UPPER UPPER DATA (32-BIT PORT)
U
PPER MIDDLE DATA (32-BIT PORT)
L
OWER MIDDLE DATA (32-BIT PORT)
L
OWER LOWER DATA (32-BIT PORT)
U
PPER DATA (16-BIT PORT)
L
OWER DATA (16-BIT PORT)
=
=
=
=
=
=
Figure 5-18. Byte Enable Signal Generation for 16- and 32-Bit Ports