910GL datasheet(209/426 Pages) INTEL

209 / 426 page

System Address Map

Datasheet

209

Compatible SMRAM Address Range (A_0000h–B_FFFFh)

When compatible SMM space is enabled, SMM-mode processor accesses to this range are routed

to physical system DRAM at 000A 0000h–000B FFFFh. Non-SMM-mode processor accesses to

this range are considered to be to the Video Buffer Area as described above. PCI Express and

DMI originated cycles to enabled SMM space are not allowed and are considered to be to the

Video Buffer Area if IGD (82915G/82915GV/82915GL/82910GL GMCH only) is not enabled as

the VGA device. PCI Express and DMI initiated cycles are attempted as peer cycles, and will

master abort on PCI if no external VGA device claims them.

Monochrome Adapter (MDA) Range (B_0000h–B_7FFFh)

Legacy support requires the ability to have a second graphics controller (monochrome) in the

system. Accesses in the standard VGA range are forwarded to IGD, PCI Express, or the DMI

(depending on the programming of the on-chip registers). Since the monochrome adapter may be

mapped to any one of these devices, the (G)MCH must decode cycles in the MDA range

(000B_0000h – 000B_7FFFh) and forward either to IGD, PCI Express, or the DMI. In addition to

the memory range B0000h to B7FFFh, the (G)MCH decodes I/O cycles at 3B4h, 3B5h, 3B8h,

3B9h, 3BAh and 3BFh and forwards them to the either IGD, PCI Express, and/or the DMI.

11.1.3

Expansion Area (C_0000h–D_FFFFh)

This 128-KB ISA Expansion region (000C_0000h – 000D_FFFFh) is divided into eight, 16-KB

segments. Each segment can be assigned one of four read/write states: read only, write only,

read/write, or disabled. Typically, these blocks are mapped through the (G)MCH and are

subtractively decoded to ISA space. Memory that is disabled is not remapped.

Non-snooped accesses from PCI Express or DMI to this region are always sent to main memory.

Table 11-1. Expansion Area Memory Segments

Memory Segments

Attributes

Comments

0C0000h–0C3FFFh

W/R

Add-on BIOS

0C4000h–0C7FFFh

W/R

Add-on BIOS

0C8000h–0CBFFFh

W/R

Add-on BIOS

0CC000h –0CFFFFh

W/R

Add-on BIOS

0D0000h–0D3FFFh

W/R

Add-on BIOS

0D4000h–0D7FFFh

W/R

Add-on BIOS

0D8000h–0DBFFFh

W/R

Add-on BIOS

0DC000h–0DFFFFh

W/R

Add-on BIOS

910GL 데이터시트(PDF) 209 Page - Intel Corporation

910GL 데이터시트(HTML) 209 Page - Intel Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL