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Section 7 Cache
Rev. 4.00 Sep. 14, 2005 Page 192 of 982
REJ09B0023-0400
7.4.3 Usage
Examples
Invalidating Specific Entries
Specific cache entries can be invalidated by writing 0 to the entry's V bit in the memory mapping
cache access. When the A bit is 1, the address tag specified by the write data is compared to the
address tag within the cache selected by the entry address, and data is written to the bits V and U
specified by the write data when a match is found. If no match is found, there is no operation.
When the V bit of an entry in the address array is set to 0, the entry is written back if the entry's U
bit is 1.
An example when a write data is specified in R0 and an address is specified in R1 is shown below.
; R0=H'0110 0000; tag address=B'0000 0001 0001 0000 0000 00, U=0, V=0
; R1=H'F000 0088; address array access, entry=B'00001000, A=1
;
MOV.L R0,@R1
Reading the Data of a Specific Entry
The data section of a specific cache entry can be read by the memory mapping cache access. The
longword indicated in the data field of the data array in figure 7.4 is read into the register.
An Example when an address is specified in R0 and data is read in R1.
; R0
=
H'F100 004C; data array access, entry
=
B'00000100,
; Way
=
0, longword address
=
3
;
MOV.L @R0,R1 ; Longword 3 is read.
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...
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Страница 1036: ...SH7641 Hardware Manual...