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Chapter 6
Instruction Cache
Preliminary User’s Manual U15839EE1V0UM00
6.4 Instruction
Cache
Operation
(1)
Instruction Cache Basic Operation
The instruction cache automatically performs a caching operation whenever there is a fetch
access to a cacheable area set using the cache configuration register BHC.
(2)
Operation on Instruction Cache Hit
(1)
On a fetch access from memory, the CPU outputs the instruction fetch request and the
concerned address to the instruction cache.
(2)
If a hit occurs due to the address existing in the instruction cache, the instruction data is
read from the instruction cache and passed through to the CPU.
Figure 6-6:
Operation on Instruction Cache Hit
Instruction Cache
Instruction
Cache Interface
CPU
NB85E
(2)
(1)
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