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Section 7 Cache
Rev. 4.00 Sep. 14, 2005 Page 186 of 982
REJ09B0023-0400
Table 7.7
LRU and Way Replacement (when W2LOCK=0 and W3LOCK=1)
LRU (Bits 5 to 0)
Way to be Replaced
000000, 000001, 000011, 001011, 100000, 100001, 101001, 101011
2
000100, 000110, 000111, 001111, 010100, 010110, 011110, 011111
1
110000, 110100, 111000, 111001, 111011, 111100, 111110, 111111
0
Table 7.8
LRU and Way Replacement (when W2LOCK=1 and W3LOCK=1)
LRU (Bits 5 to 0)
Way to be Replaced
000000, 000001, 000011, 000100, 000110, 000111, 001011, 001111,
010100, 010110, 011110, 011111
1
100000, 100001, 101001, 101011, 110000, 110100, 111000, 111001,
111011, 111100, 111110, 111111
0
7.3 Cache
Operation
7.3.1 Searching
Cache
If the cache is enabled (CE bit in CCR register is 1), whenever instructions or data in spaces of P0,
P1, and P3 are accessed the cache will be searched to see if the desired instruction or data is in the
cache. Figure 7.2 illustrates the method by which the cache is searched. The cache is a physical
cache of which tag address hold an address.
Entries are selected using bits 11 to 4 of the address used to access memory (virtual address) and
the tag address of that entry is read. The physical address (bits 31 to 12) after translation and the
physical address read from the address section are compared. The address comparison uses all four
ways. When the comparison shows a match and the selected entry is valid (V
=
1), a cache hit
occurs. When the comparison does not show a match or the selected entry is not valid (V
=
0), a
cache miss occurs. Figure 7.2 shows a hit on way 1.
Содержание HD6417641
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Страница 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
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Страница 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Страница 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Страница 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Страница 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Страница 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Страница 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Страница 500: ...Section 13 Direct Memory Access Controller DMAC Rev 4 00 Sep 14 2005 Page 450 of 982 REJ09B0023 0400...
Страница 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Страница 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Страница 734: ...Section 18 Multi Function Timer Pulse Unit MTU Rev 4 00 Sep 14 2005 Page 684 of 982 REJ09B0023 0400...
Страница 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Страница 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Страница 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Страница 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Страница 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Страница 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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Страница 1036: ...SH7641 Hardware Manual...