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VR4102 Datasheet(PDF) 143 Page - NEC |
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VR4102 Datasheet(HTML) 143 Page - NEC |
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143 / 701 page  CHAPTER 5 MEMORY MANAGEMENT SYSTEM 143 Figure 5-11. Format of a TLB Entry (1/2) (a) PageMask Register 18 19 0 31 11 10 0 MASK 0 13 8 11 MASK : Page comparison mask, which determines the virtual page size for the corresponding entry. 0 : Reserved for future use. Write 0 in a write operation. When this field is read, 0 is read. (b) EntryHi Register 39 40 (a) 32-bit mode 8 3 21 0 31 11 10 8 7 VPN2 0 ASID (b) 64-bit mode 62 61 8 3 2 22 29 0 63 11 10 8 7 R Fill VPN2 0 ASID VPN2: Virtual page number divided by two (mapping to two pages) ASID : Address space ID. An 8-bit ASID field that lets multiple processes share the TLB; each process has a distinct mapping of otherwise identical virtual page numbers. R : Space type (00 o user, 01 o supervisor, 11 o kernel). Matches bits 63 and 62 of the virtual address. Fill : Reserved. Ignored on write. When read, returns zero. 0 : Reserved for future use. Write 0 in a write operation. When this field is read, 0 is read. |
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