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8. Operation while Cache is Enabled
When cache is enabled, the emulator operates as shown in table 2.4.
Table 2.4 Operation while Cache is Enabled
Function Operation Notes
Memory write Searches for whether or not the address to be
written hits the instruction and operand caches.
• When the address hits, the corresponding
position of the data array is changed by the
data to be written and single write is
performed to the external area.
• When the address does not hit, the cache
contents are not changed and single write is
performed to the external area.
• The contents of the
address array are not
changed before or
after writing of
memory.
Memory read Searches for whether or not the address to be
read hits the operand cache.
• When the address hits, the corresponding
position of the data array is read.
• When the address does not hit, single write
is performed to the external area.
• The instruction cache
is not searched for.
• The contents of the
address array are not
changed before or
after reading of
memory.
BREAKPOINT Clears the V and LRU bits of all entries in the
instruction cache to 0 if a BREAKPOINT is set
or canceled.
Clears the V and LRU bits of all entries in the
instruction cache to 0 if a break occurs when a
BREAKPOINT has been set.
• Use the Event
Condition if you do not
wish to change the
contents of the
instruction cache.
Program load Writes the contents of the data cache to the
external memory and clears the V and LRU bits
of entries in the instruction and data caches to
0 after loading of the program has been
completed.
If memory is read from or written to the disabled cache area, cache is not searched for but the
external area is accessed.