r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 267

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

8.6.5
Associative writing to the IC and OC address arrays may not be supported in future SuperH-
family products. The use of instructions ICBI, OCBI, OCBP, and OCBWB is recommended.
These instructions handle ITLB misses, and notify instruction TLB miss exceptions and data TLB
miss exceptions, thus providing a sure way of controlling the IC and OC. As a transitional
measure, this LSI generates address errors when this function is used. If compatibility with
previous products is a crucial consideration, on the other hand, the MMCAW bit in EXPMASK
(H'FF2F 0004) can be set to 1 to enable this function. However, instructions ICBI, OCBI, OCBP,
and OCBWB should be used to guarantee compatibility with future SuperH-family products.
Memory-Mapped Cache Associative Write Operation
Figure 8.8 Memory-Mapped OC Data Array (Cache size = 32 Kbytes)
Address field
L
*
: Longword specification bits
: Don't care
Data field
31
31
1 1 1 1 0 1 0 1
24
23
* * * * * * * * *
Longword data
15
Way
14
1312
Rev.1.00 Jan. 10, 2008 Page 237 of 1658
Entry
5 4 3 2 1 0
L
REJ09B0261-0100
0
0
0
8. Caches