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SH7041A Fiches technique(PDF) 193 Page - Renesas Technology Corp

No de pièce SH7041A
Description  Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)
PDF  923 Pages
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Fabricant  RENESAS [Renesas Technology Corp]
Site Internet  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7041A Fiches technique(HTML) 193 Page - Renesas Technology Corp

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Section 9 Cache Memory (CAC)
9.1
Overview
The LSI has an on-chip cache memory (CAC) with 1 kbyte of cache data and a 256-entry cache
tag. The cache data and cache tag space can be used as on-chip RAM space when the cache is not
being used.
9.1.1
Features
The CAC has the following features. The cache tag and cache data configuration is shown in
figure 9.1.
• 1-kbyte capacity
• External memory (CS space and DRAM space) instruction code and PC relative data caching
• 256 entry cache tag (tag address 15 bits)
• 4-byte line length
• Direct map replacement algorithm
• Valid flag (1 bit) included for purges
Cache tag
256 entries
Data (32 bits)
Tag address (15 bits)
Cache data
Data bus
Hit signal
CPU
address
Tag
address
Entry
address
Offset
Valid bit (1 bit)
CMP
15
8
2
Figure 9.1 Cache Tag and Cache Data Configuration



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