8.
Caches
Rev.1.00 Jan. 10, 2008 Page 213 of 1658
REJ09B0261-0100
31
5 4
2
LW0
32 bits
LW1
32 bits
LW2
32 bits
LW3
32 bits
LW4
32 bits
LW5
32 bits
LW6
32 bits
LW7
32 bits
MMU
[12:5]
255
19 bits
1 bit
Ta
g
V
Address array
(way 0 to way 3)
Data array
(way 0 to way3)
Entry selection
Lon
g
word (LW) selection
Virtual address
3
8
22
19
0
Read data
13 12
10
0
6 bits
LRU
Hit si
g
nal
(Way 0 to way 3)
Comparison
Figure 8.2 Configuration of Instruction Cache (Cache size = 32 Kbytes)
•
Tag
Stores the upper 19 bits of the 29-bit physical address of the data line to be cached. The tag is
not initialized by a power-on or manual reset.
•
V bit (validity bit)
Indicates that valid data is stored in the cache line. When this bit is 1, the cache line data is
valid. The V bit is initialized to 0 by a power-on reset, but retains its value in a manual reset.
•
U bit (dirty bit)
The U bit is set to 1 if data is written to the cache line while the cache is being used in copy-
back mode. That is, the U bit indicates a mismatch between the data in the cache line and the
data in external memory. The U bit is never set to 1 while the cache is being used in write-
through mode, unless it is modified by accessing the memory-mapped cache (see section 8.6,
Memory-Mapped Cache Configuration). The U bit is initialized to 0 by a power-on reset, but
retains its value in a manual reset.
Содержание SH7781
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