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型號(hào)：	μPD98501
廠(chǎng)商：	NEC Corp.
英文描述：	Network Controller(網(wǎng)絡(luò)控制器)
中文描述：	網(wǎng)絡(luò)控制器（網(wǎng)絡(luò)控制器）
文件頁(yè)數(shù)：	134/671頁(yè)
文件大?。?/td>	2229K
代理商：	ΜPD98501

Preliminary User’s Manual S14767EJ1V0UM00

2.5.2.2 32-bit mode address translation

Figure 2-36 shows the virtual-to-physical-address translation of a 32-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 1 K, 4 K, 16 K, 64 K, and 256 K.

Shown at the top of Figure 2-36 is the virtual address space in which the page size is 1 Kbyte and the offset

is 10 bits. The 22 bits excluding the ASID field represents the virtual page number (VPN), enabling selecting

a page table of 4 M entries.

Shown at the bottom of Figure 2-36 is the virtual address space in which the page size is 256 Kbytes and the

offset is 18 bits. The 14 bits excluding the ASID field represents the VPN, enabling selecting a page table of

16 K entries.

Figure 2-36. 32-bit Mode Virtual Address Translation

Bits 31 to 29 of the virtual

address select the user,

supervisor, or kernel

address space.

Virtual address for 16 K (2

) 256-Kbyte pages

Virtual address for 4M (2

) 1-Kbyte pages

22 bits = 4 M 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

14 bits = 16 K pages

32-bit physical address

2.5.2.3 64-bit mode address translation

Figure 2-37 shows the virtual-to-physical-address translation of a 64-bit mode address. This figure illustrates the

two possible page size; a 1-Kbyte page (10 bits) and a 256-Kbyte page (18 bits).

Shown at the top of Figure 2-37 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.

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