Section 8 Cache
Rev. 0.50 May 18, 2006 Page 206 of 1588
REJ09B0313-0050
Operations in sections 8.3.2 to 8.3.5 are summarized in table 8.8.
Table 8.8
Cache Operations
Cache CPU
Cycle
Hit/
miss
Write-back mode/
write through
mode
U
Bit
External Memory
Accession
(through internal bus)
Cache Contents
Instruction
cache
Instruction
fetch
Hit
Not generated
Not renewed
Miss
Cache renewal cycle is
generated
Renewed to new values by
cache renewal cycle
Operand
cache
Prefetch/
read
Hit
Either mode is
available
x
Not generated
Not renewed
Miss
Write-through
mode
Cache renewal cycle is
generated
Renewed to new values by
cache renewal cycle
Write-back mode
0
Cache renewal cycle is
generated
Renewed to new values by
cache renewal cycle
1
Cache renewal cycle is
generated. Then write-back
cycle in write-back buffer is
generated.
Renewed to new values by
cache renewal cycle
Write
Hit
Write-through
mode
Write cycle CPU issues is
generated.
Renewed to new values by write
cycle the CPU issues
Write-back
mode
x
Not generated
Renewed to new values by write
cycle the CPU issues
Miss
Write-through
mode
Write cycle CPU issues is
generated.
Not renewed
*
Write-back mode
0
Cache renewal cycle is
generated
Renewed to new values by
cache renewal cycle.
Subsequently renewed again to
new values in write cycle CPU
issues.
1
Cache renewal cycle is
generated. Then write-back
cycle in write-back buffer is
generated.
Renewed to new values by
cache renewal cycle.
Subsequently renewed again to
new values in write cycle CPU
issues.
[Legend]
x: Don't
care.
Note: Cache renewal cycle: 16-byte read access, write-back cycle in write-back buffer: 16-byte
write access
*
Neither LRU renewed. LRU is renewed in all other cases.
Содержание Single-Chip Microcomputer SH7203
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