R0K572030S000BE Renesas Electronics America, R0K572030S000BE Datasheet - Page 253

Manufacturer Part Number

R0K572030S000BE

KIT DEV FOR SH7203

Manufacturer

Renesas Electronics America

Renesas Starter Kits (RSK)r

CPU Board, LCD Module, E10A-Lite Emulator, Cable, QuickStart Guide and CD-ROM

Silicon Manufacturer

Kit Contents

Silicon Family Name

Silicon Core Number

R5S72030W200FP

Tool / Board Applications

General Purpose MCU, MPU, DSP, DSC

Mcu Supported Families

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

For Use With/related Products

Lead Free Status / Rohs Status

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 but not initialized by a manual reset

or in software standby mode.

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 and Way Replacement (Cache Lock Function Not Used)

Rev. 3.00 Sep. 28, 2009 Page 221 of 1650

Way to be Replaced

REJ09B0313-0300

Section 8 Cache