HD6417705 Datasheet, PDF (145/739 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Table 4.3 Way Replacement when a PREF Instruction Misses the Cache
DSP Bit W3LOAD W3LOCK W2LOAD W2LOCK Way to be Replaced
0
*
*
*
*
Determined by LRU (table 4.2)
1
*
0
*
0
Determined by LRU (table 4.2)
1
*
0
0
1
Determined by LRU (table 4.5)
1
0
1
*
0
Determined by LRU (table 4.6)
1
0
1
0
1
Determined by LRU (table 4.7)
1
0
*
1
1
Way 2
1
1
1
0
*
Way 3
Notes: * Don’t care
W3LOAD and W2LOAD should not be set to 1 at the same time.
Table 4.4 Way Replacement when Instructions other than the PREF Instruction Miss the
Cache
DSP Bit W3LOAD W3LOCK W2LOAD W2LOCK Way to be Replaced
0
*
*
*
*
Determined by LRU (table 4.2)
1
*
0
*
0
Determined by LRU (table 4.2)
1
*
0
*
1
Determined by LRU (table 4.5)
1
*
1
*
0
Determined by LRU (table 4.6)
1
*
1
*
1
Determined by LRU (table 4.7)
Notes: * Don’t care
W3LOAD and W2LOAD should not be set to 1 at the same time.
Table 4.5 LRU and Way Replacement (when W2LOCK = 1 and W3LOCK = 0)
LRU (Bits 5 to 0)
000000, 000001, 000100, 010100, 100000, 100001, 110000, 110100
000011, 000110, 000111, 001011, 001111, 010110, 011110, 011111
101001, 101011, 111000, 111001, 111011, 111100, 111110, 111111
Way to be Replaced
3
1
0
Table 4.6 LRU and Way Replacement (when W2LOCK = 0 and W3LOCK = 1)
LRU (Bits 5 to 0)
000000, 000001, 000011, 001011, 100000, 100001, 101001, 101011
000100, 000110, 000111, 001111, 010100, 010110, 011110, 011111
110000, 110100, 111000, 111001, 111011, 111100, 111110, 111111
Way to be Replaced
2
1
0
Rev. 2.00, 09/03, page 99 of 690