GXM datasheet(93/244 Pages) NSC

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Integrated Functions (Continued)

Figure 4-2. Geode™ GXm Processor Memory Space

Conventional Memory

UMBs and Expansion ROMs

Video BIOS

System BIOS

Extended Memory

PCI Access

Scratchpad

VGA/MDA

Frame Buffers

(Soft VGA and/or PCA/ISA)

Internal Bus IF Unit Registers

Graphics Pipeline Registers

SMMSystemCode

(Frame Buffer, etc.)

PCI Access

ROM Access

(256 KB)

A0000h (640 KB)

C0000h

E0000h

100000h (1 MB)

E8000h

GX_BASE+8000h

GX_BASE+9000h

GX_BASE+400000h

GX_BASE+800000h

GX_BASE+1000000h

FFFC0000h

FFFFFFFFh (4 GB)

Extended Memory

Graphics Memory

(Frame Buffer, etc.)

A0000h (640 KB)

C0000h

E0000h

100000h (1 MB)

E8000h

Shadowed Video BIOS

Shadowed System BIOS

SMMSystemCode

Physical Address Map

DRAM Map

MAX

*GBADD or Top of DRAM

*Top of DRAM

PCI Access

Display Controller Registers

Memory Controller Registers

Graphics Memory

* See BC_DRAM_TOP Table 4-10 on page 101 or MC_GBASE_ADD on page 111.

(See Table 4-29 on page 136)

(See Table 4-24 on page 124)

(See Table 4-9 on page 101)

GX_BASE (See Table

4-1 on page 92)

FFFF FFFFh

MAX

Conventional Memory

UMBs and

Expansion ROMs

GX_BASE+8500h

GX_BASE+8400h

(See Table 4-15 on page 108)

GX_BASE+8300h

GX_BASE+8100h

(See Table 4-5 on page 97)

GX_BASE+1000h

Power Management Registers

(See Table 6-1 on page 179)

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