SH7713 datasheet(270/904 Pages) RENESAS

270 / 904 page

Section 6 Cache

Rev.1.50 Aug. 30, 2006 Page 230 of 860

REJ09B0288-0150

6.4.3

Usage Examples

Invalidating Specific Entries: Specific cache entries can be invalidated by writing 0 to the

entry’s V bit in the memory-mapped 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

a match is found, the entry is written back if the entry’s U bit is 1 and the V bit and U bit specified

by the write data are written. If no match is found, there is no operation. In the example shown

below, R0 specifies the write data and R1 specifies the address.

; R0

=H'01100010; VPN=B'0000 0001 0001 0000 0000 00, U=0, V=0

; R1

=H'F0000088; address array access, entry=B'00001000, A=1

;

MOV.L R0,@R1

Reading the Data of a Specific Entry: To read the data field of a specific entry is enabled by the

memory-mapped cache access. The longword indicated in the data field of the data array in figure

6.4 or 6.5 is read into the register. In the example shown below, R0 specifies the address and R1

shows what is read.

; R0

=H'F100 004C; data array access, entry=B'00000100

; Way

= 0, longword address = 3

;

MOV.L @R0,R1 ; Longword 3 is read.

SH7713 Datasheet(PDF) 270 Page - Renesas Technology Corp