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VR4102 Datasheet(PDF) 120 Page - NEC |
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VR4102 Datasheet(HTML) 120 Page - NEC |
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120 / 701 page  CHAPTER 5 MEMORY MANAGEMENT SYSTEM 120 5.2.3 64-bit Mode Address Translation Figure 5-3 shows the virtual-to-physical-address translation of a 64-bit mode address. The pages can have five different sizes between 1 Kbyte (10 bits) and 256 Kbytes (18 bits), each being 4 times as large as the preceding one in ascending order, that is 1K, 4K, 16K, 64K, and 256K. This figure illustrates the two possible page sizes: a 1- Kbyte page (10 bits) and a 256-Kbyte page (18 bits). a Shown at the top of Figure 5-3 is the virtual address space in which the page size is 1 Kbyte and the offset is 10 bits. The 30 bits excluding the ASID field represents the virtual page number (VPN), enabling selecting a page table of 1 G entry. a Shown at the bottom of Figure 5-3 is the virtual address space in which the page size is 256 Kbytes and the offset is 18 bits. The 22 bits excluding the ASID field represents the VPN, enabling selecting a page table of 4 M entries. Figure 5-3. 64-bit Mode Virtual Address Translation 31 PFN 32-bit physical address 10 22 30 8 0 0 9 10 39 40 61 62 63 64 71 ASID Offset TLB 18 22 22 8 0 17 18 39 40 61 62 63 64 71 ASID TLB 0 or -1 0 or -1 VPN Offset VPN Offset Bits 62 and 63 of the virtual address select the user, supervisor, or kernel address space. Virtual address for 4M (2 22) 256-Kbyte pages Virtual address for 1G (2 30) 1-Kbyte pages 30 bits = 1G pages The offset is passed to physical address without being changed. The offset is passed to physical address without being changed. Virtual-to-physical address translation with the TLB Virtual-to-physical address translation with the TLB 22 bits = 4M pages 2 2 |
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