Section 8 Caches
Rev.1.00 Dec. 13, 2005 Page 200 of 1286
REJ09B0158-0100
•
Data array
The data field holds 32 bytes (256 bits) of data per cache line. The data array is not initialized
by a power-on or manual reset.
•
LRU
In a 4-way set-associative method, up to 4 items of data can be registered in the cache at each
entry address. When an entry is registered, the LRU bit indicates which of the 4 ways it is to be
registered in. The LRU mechanism uses 6 bits of each entry, and its usage is controlled by
hardware. The LRU (least-recently-used) algorithm is used for way selection, and selects the
less recently accessed way. The LRU bits are initialized to 0 by a power-on reset but not by a
manual reset. The LRU bits cannot be read from or written to by software.
8.2 Register
Descriptions
The following registers are related to cache.
Table 8.3
Register Configuration
Register Name
Abbreviation
R/W
P4 Address
*
Area 7 Address
*
Access
Size
Cache control register
CCR
R/W
H
'
FF00 001C
H
'
1F00 001C
32
Queue address control register 0
QACR0
R/W
H
'
FF00 0038
H
'
1F00 0038
32
Queue address control register 1
QACR1
R/W
H
'
FF00 003C
H
'
1F00 003C
32
On-chip memory control register
RAMCR
R/W
H
'
FF00 0074
H
'
1F00 0074
32
Note:
*
These P4 addresses are for the P4 area in the virtual address space. These area 7
addresses are accessed from area 7 in the physical address space by means of the
TLB.
Table 8.4
Register States in Each Processing State
Register Name
Abbreviation
Power-on Reset
Manual Reset
Sleep
Cache control register
CCR
H
'
0000 0000
H
'
0000 0000
Retained
Queue address control register 0
QACR0
Undefined
Undefined
Retained
Queue address control register 1
QACR1
Undefined
Undefined
Retained
On-chip memory control register
RAMCR
H
'
0000 0000
H
'
0000 0000
Retained
Содержание SH7780 Series
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Страница 450: ...Section 11 Local Bus State Controller LBSC Rev 1 00 Dec 13 2005 Page 400 of 1286 REJ09B0158 0100 ...
Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
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Страница 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
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