MC68030 Datasheet, PDF (336/602 Pages) Motorola, Inc – ENHANCED 32-BIT MICROPROCESSOR

Memory Management Unit
When RWM is set to one, both read and write accesses of a matching address are trans-
parently translated. For transparent translation of read-modify-write cycles with matching
addresses, RWM must be set to one. If the RWM bit equals zero, neither the read nor the
write of any read-modify-write cycle is transparently translated with the TTx register.
Function Code Base (FC BASE)
This 3-bit field defines the base function code for accesses to be transparently translated
with this register. Addresses with function codes that match the FC BASE field (and are
otherwise eligible) are transparently translated.
Function Code Mask (FC MASK)
This 3-bit field contains a mask for the FC BASE field. Setting a bit in this field causes
the corresponding bit of the FC BASE field to be ignored.
LOGICAL ADDRESS BASE
This 8-bit field is compared with address bits A31-A24. Addresses that match in this
comparison (and are otherwise eligible) are transparently translated.
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MC68030 USER’S MANUAL
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