Motorola MC68030 User Manual page 173

Bus Operation
A0
A1
SIZ0
SIZ1
R/W
NOTE: These select lines can be combined with the address decode circuitry or all can be generated within the same
programmed array logic unit.
Figure 7-18. Byte Data Select Generation for 16- and 32-Bit Ports
7-26
UUD = UPPER UPPER DATA (32-BIT PORT)
UMD = UPPER MIDDLE DATA (32-BIT PORT)
LMD = LOWER MIDDLE DATA (32-BIT PORT)
LLD = LOWER LOWER DATA (32-BIT PORT)
UD = UPPER DATA (16-BIT PORT)
LD
MC68030 USER'S MANUAL
= LOWER DATA (16-BIT PORT)
UUD
UMD
LMD
LLD
UD
LD
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