r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 221

• Manufacturer Part Number: r5s72060w200fpv
• Description: 32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
• Manufacturer: Renesas Electronics Corporation.

7.4.3
(1)
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 tag address specified by the write data is compared to the
tag address 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.
(2)
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 is shown below.
7.4.4
1. Programs that access memory-mapped cache should be placed in a cache-disabled space.
2. Rewriting the address array contents so that two or more ways are hit simultaneously is
3. Memory-mapped cache can be accessed only by the CPU and not by the DMAC. Registers can
; R0=H'0110 0010; tag address(28-11)=B'0 0001 0001 0000 0000 0, U=0, V=0
; R1=H'F080 0088; operand cache address array access, entry=B'000 1000, A=1
;
; R0=H'F100 004C; instruction cache data array access, entry=B'000 0100,
; Way=0, longword address=3
;
MOV.L R0,@R1
MOV.L @R0,R1
prohibited. Operation is not guaranteed if the address array contents are changed so that two or
more ways are hit simultaneously.
be accessed by the CPU and the DMAC.
Invalidating Specific Entries
Reading the Data of a Specific Entry
Usage Examples
Notes
Rev. 2.00 Dec. 09, 2005 Page 197 of 1152
REJ09B0191-0200
Section 7 Cache