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Chapter 12 Instruction Cache
3.Operating mode conditions
3. Operating mode conditions
● Cache status in various operating modes
The table below indicates the prevailing state for disable and flush when the associated bit is
changed by bit manipulation instruction, etc.
Immediately
after a Reset
Disable (FNAB=0) Flushed
Cache Memory
Contents
undefined
The preceding state is held.
Rewriting is impossible while
the cache is disabled.
The preceding state is held.
Tag Address
Tag
Contents
undefined
The preceding state is held.
Rewriting is impossible while
the cache is disabled.
The preceding state is held.
Sub-block
Valid Bit
Contents
undefined
The preceding state is held.
Rewriting is impossible while
the cache is disabled.
The preceding state is held.
LRU Bit Contents
undefined
The preceding state is held.
Rewriting is impossible while
the cache is disabled.
The preceding state is held.
Entry Lock
Bit
Contents
undefined
The preceding state is held.
Rewriting is impossible while
the cache is disabled.
The preceding state is held.
(entry lock release is required)
TAG Valid
Bit
Contents
undefined
The preceding state is held.
Flushingis possible while the
cache is disabled.
All entries are invalid.
RAM Normal Mode The preceding state is held.
Flushing is possible while
the cache is disabled.
The preceding state is held.
Control
Register
Global
Lock
Unlock The preceding state is held.
Rewriting is possible while
the cache is disabled.
The preceding state is held.
Auto lock
Fail
No fail The preceding state is held.
Rewriting is possible while
the cache is disabled.
The preceding state is held.
Entry Auto
Lock
Unlock The preceding state is held.
Rewriting is possible while
the cache is disabled.
The preceding state is held.
Entry Lock
Release
No release The preceding state is held.
Rewriting is possible while
the cache is disabled.
The preceding state is held.
Enable Disable Disabled The preceding state is held.
Flush Not flushed The preceding state is held.
Rewriting is possible while
the cache is disabled.
Flushed in cycle following
memory accessing.
Reverts to 0 subsequently.