VR4102 datasheet(126/701 Pages) NEC

126 / 701 page

CHAPTER 5 MEMORY MANAGEMENT SYSTEM

126

Table 5-2. 32-bit and 64-bit Supervisor Mode Segments

Address bit

Status register bit value

Segment

Address range

Size

value

KSU

EXL

ERL

name

32-bit

A[31] = 0

suseg

0x0000 0000

0x7FFF FFFF

2 Gbytes

31 bytes)

32-bit

A[31..29] = 110

sseg

0xC000 0000

0xDFFF FFFF

512 Mbytes

29 bytes)

64-bit

A[63..62] = 00

xsuseg

0x0000 0000 0000 0000

0x0000 00FF FFFF FFFF

1 Tbyte

40 bytes)

64-bit

A[63..62] = 01

xsseg

0x4000 0000 0000 0000

0x4000 00FF FFFF FFFF

1 Tbyte

40 bytes)

64-bit

A[63..62] = 11

csseg

0xFFFF FFFF C000 0000

0xFFFF FFFF DFFF FFFF

512 Mbytes

29 bytes)

(1) suseg (32-bit Supervisor mode, user space)

When SX = 0 in the Status register and the most-significant bit of the virtual address space is set to 0, the suseg

virtual address space is selected; it covers 2 Gbytes (2

31 bytes) of the current user address space. The virtual

address is extended with the contents of the 8-bit ASID field to form a unique virtual address. This mapped

space starts at virtual address 0x0000 0000 and runs through 0x7FFF FFFF.

(2) sseg (32-bit Supervisor mode, supervisor space)

When SX = 0 in the Status register and the three most-significant bits of the virtual address space are 110, the

sseg virtual address space is selected; it covers 512 Mbytes (229 bytes) of the current supervisor virtual address

space. The virtual address is extended with the contents of the 8-bit ASID field to form a unique virtual address.

This mapped space begins at virtual address 0xC000 0000 and runs through 0xDFFF FFFF.

(3) xsuseg (64-bit Supervisor mode, user space)

When SX = 1 in the Status register and bits 63 and 62 of the virtual address space are set to 00, the xsuseg

virtual address space is selected; it covers 1 Tbyte (2

40 bytes) of the current user address space. The virtual

address is extended with the contents of the 8-bit ASID field to form a unique virtual address. This mapped

space starts at virtual address 0x0000 0000 0000 0000 and runs through 0x0000 00FF FFFF FFFF.

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