R0K572011S000BE Renesas Electronics America, R0K572011S000BE Datasheet - Page 211

• Manufacturer Part Number: R0K572011S000BE
• Description: KIT STARTER FOR SH7201
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572011S000BE

• Contents: CPU Board, LCD Display Module, E8 Emulator, Cable, QuickStart Guide and CD-ROM
• For Use With/related Products: SH7201
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SH7201 Group
(3)
With the 4-way set associative system, up to four instructions or data with the same entry address
can be registered in the cache. When an entry is registered, LRU shows which of the four ways it
is recorded in. There are six LRU bits, controlled by hardware. A least-recently-used (LRU)
algorithm is used to select the way that has been least recently accessed.
Six LRU bits indicate the way to be replaced in case of a cache miss. The relationship between
LRU and way replacement is shown in table 8.1 when the cache lock function (only for operand
cache) is not used (concerning the case where the cache lock function is used, see section 8.2.2,
Cache Control Register 2 (CCR2)). If a bit pattern other than those listed in table 8.1 is set in the
LRU bits by software, the cache will not function correctly. When modifying the LRU bits by
software, set one of the patterns listed in table 8.1.
The LRU bits are initialized to B'000000 by a power-on reset and in deep standby but not
initialized by a manual reset or in software standby mode.
Table 8.1
R01UH0026EJ0300 Rev. 3.00
Sep 24, 2010
LRU (Bits 5 to 0)
000000, 000100, 010100, 100000, 110000, 110100
000001, 000011, 001011, 100001, 101001, 101011
000110, 000111, 001111, 010110, 011110, 011111
111000, 111001, 111011, 111100, 111110, 111111
LRU
LRU and Way Replacement (Cache Lock Function Not Used)
Way to be Replaced
3
2
1
0
Section 8 Cache
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