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VR4102 Datasheet(PDF) 216 Page - NEC |
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VR4102 Datasheet(HTML) 216 Page - NEC |
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216 / 701 page  CHAPTER 8 CACHE MEMORY 216 8.2.3 Accessing the Caches Figure 8-5 shows the virtual address (VA) index into the caches. The number of virtual address bits used to index the instruction and data caches depends on the cache size. (1) Data cache addressing This addressing uses bits VA [9:4]. The most significant bit is VA9 because the cache size is 1 Kbyte. The least significant bit is VA4 because the line size is 4 words (16 bytes). (2) Instruction cache addressing This addressing uses bits VA [11:4]. The most significant bit is VA11 because the cache size is 4 Kbytes. The least significant bit is VA4 because the line size is 4 words (16 bytes). Figure 8-5. Cache Data and Tag Organization Tags Tag line Tags Tags Tags Data Tag line Data line P V Tag W Data 64 VA (9:4) for 1-Kbyte D-cache and VA (11:4) for 4-Kbyte I-cache |
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