Renesas Stereo System SH7709S User Manual
Rev. 5.00, 09/03, page 105 of 760
The LRU bits are initialized to 000000 by a power-on reset, but are not initialized by a manual
reset.
reset.
Table 5.2
LRU and Way Replacement (When the cache lock function is not used)
LRU (5–0)
Way to be Replaced
000000, 000100, 010100, 100000, 110000, 110100
3
000001, 000011, 001011, 100001, 101001, 101011
2
000110, 000111, 001111, 010110, 011110, 011111
1
111000, 111001, 111011, 111100, 111110, 111111
0
5.1.3
Register Configuration
Table 5.3 shows details of the cache control register.
Table 5.3
Register Configuration
Register
Abbr.
R/W
Initial Value
Address
Access Size
Cache control register
CCR
R/W
H'00000000
H'FFFFFFEC
32-bit
Cache control register 2
CCR2
R/W
H'00000000
H'040000B0
(H’A40000B0)
(H’A40000B0)
*
32-bit
Note:
*
When address translation by the MMU does not apply, the address in parentheses should
be used.
be used.
5.2
Register Description
5.2.1
Cache Control Register (CCR)
The cache is enabled or disabled using the CE bit of the cache control register (CCR). CCR also
has a CF bit (which invalidates all cache entries), and a WT and CB bits (which select either write-
through mode or write-back mode). Programs that change the contents of the CCR register should
be placed in address space that is not cached. When updating the contents of the CCR register,
always set bits 4 to 0. Figure 5.2 shows the configuration of the CCR register.
has a CF bit (which invalidates all cache entries), and a WT and CB bits (which select either write-
through mode or write-back mode). Programs that change the contents of the CCR register should
be placed in address space that is not cached. When updating the contents of the CCR register,
always set bits 4 to 0. Figure 5.2 shows the configuration of the CCR register.