GX1 datasheet(98/247 Pages) NSC

98 / 247 page

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Revision 1.0

Integrated Functions (Continued)

Figure 4-2. GX1 Processor Memory Space

Conventional Memory

UMBs and Expansion ROMs

Video BIOS

System BIOS

Extended Memory

Scratchpad RAM

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+8800000h

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 in Table 4-8 on page 104 or MC_GBASE_ADD in Table 4-15 on Page 116.

(See Table 4-28 on page 141)

(See Table 4-23 on page 129)

(See Table 4-8 on page 104)

FFFF FFFFh

MAX

Conventional Memory

UMBs and

Expansion ROMs

GX_BASE+8500h

GX_BASE+8400h

(See Table 4-14 on page 112)

GX_BASE+8300h

GX_BASE+8100h

(See Table 4-3 on page 100)

GX_BASE+1000h

Power Management Registers

(See Table 5-1 on page 182)

GX_BASE

Available to the system

PCI Access

Available to the system

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