SH7713 datasheet(262/904 Pages) RENESAS

Part #	SH7713

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

PDF	904 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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Section 6 Cache

Rev.1.50 Aug. 30, 2006 Page 222 of 860

REJ09B0288-0150

6.3

Operation

6.3.1

Searching the Cache

If the cache is enabled (the CE bit in CCR1 = 1), whenever instructions or data in spaces P0, P1,

P3, and U0 are accessed the cache will be searched to see if the desired instruction or data is in the

cache. Figure 6.2 illustrates the method by which the cache is searched. The cache is a physical

cache and holds physical addresses in its address section.

Entries are selected using bits 12 to 4 of the address (virtual) of the access to memory and the tag

address of that entry is read. The virtual address (bits 31 to 10) of the access to memory and the

physical address (tag address) read from the address array are compared. The address comparison

uses all four ways. When the comparison shows a match and the selected entry is valid (V = 1), a

cache hit occurs. When the comparison does not show a match or the selected entry is not valid (V

= 0), a cache miss occurs. Figure 6.2 shows a hit on way 1.

SH7713 Datasheet(PDF) 262 Page - Renesas Technology Corp