r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 244
r8a77850anbg
Manufacturer Part Number
r8a77850anbg
Description
Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R8A77850ANBG.pdf
(1692 pages)
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8. Caches
• Data array
• LRU
Rev.1.00 Jan. 10, 2008 Page 214 of 1658
REJ09B0261-0100
The data field holds 32 bytes (256 bits) of data per cache line. The data array is not initialized
by a power-on or manual reset.
In a 4-way set-associative method, up to 4 items of data can be registered in the cache at each
entry address. When an entry is registered, the LRU bit indicates which of the 4 ways it is to be
registered in. The LRU mechanism uses 6 bits of each entry, and its usage is controlled by
hardware. The LRU (least-recently-used) algorithm is used for way selection, and selects the
less recently accessed way. The LRU bits are initialized to 0 by a power-on reset but not by a
manual reset. The LRU bits cannot be read from or written to by software.
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