參數(shù)資料
型號(hào)： 82443ZX
廠商： INTEL CORP
元件分類： 存儲(chǔ)控制器/管理單元
英文描述： Intel㈢ 440ZX AGPset: Host Bridge/Controller
中文描述： DRAM CONTROLLER, PBGA492
封裝： BGA-492
文件頁數(shù)： 82/116頁
文件大?。?/td> 533K
代理商： 82443ZX
Functional Description
4-2
82443ZX Host Bridge Datasheet
4.1.1
Memory Address Ranges
Figure 4-1 provides a detailed 82443ZX memory map indicating specific memory regions defined
by AGP and supported by the Intel
440ZX AGPset.
Figure 4-1. Memory System Address Space
mem_map2.vsd
Notes:
1. Graphics Device accesses to the AGP aperture
invoke AGP transfer protocol on the AGP Bus
and use GART to re- map the accesses to
graphics data structures located in main
memory.
2. The two window regions provide PCI accesses
over the AGP.
Main memory (physical memory) and
CPU extended memory (above 4 GB)
PCI memory accesses to primary PCI bus
AGP aperture, GART, and
Graphics data structures mapped by GART
PCI memory accesses to AGP
4 GB
System Memory Space
TOM (1 GB Max.)
Main
Memory
Local Graphics Memory
- Frame Buffer
- Rendering Buffer
- Depth Buffer (Z)
- Video Capture Buffer
Window For Prefetchable
PCI accesses to AGP
(Base=PMBASE Reg. (24h); Dev 1)
(Size=PMLIMIT Reg. (26h); Dev 1)
Graphics Address Re-Mapping Table
(Base=ATTBASE Reg. (B8h); Dev 0)
Window For Non-Prefetchable
PCI accesses to AGP
(Base=MBASE Reg. (20h); Dev 0)
(Size=MLIMIT Reg. (22h); Dev 0)
64 GB
Extended CPU
Memory Space
PCI Memory
PCI Memory
accesses to AGP
PCI Memory
accesses to AGP
PCI Memory
PCI Memory
Graphics Device
Access
(e.g., memory-mapped
control/status registers)
GART
AGP
Aperture
PCI Memory
AGP Data
AGP Data
AGP Data
AGP Aperture
- Textures
- Other Surfaces
- Instruction
Stream
00000h
A0000h
BFFFFh
System/Application SW
Graphics Adapter
(128 KB)
C0000h
Video BIOS
(shadowed in memory)
0FFFFFh
DOS
Compatibility
Memory
1 MB
Optional ISA Hole
15 MB
16 MB
Upper BIOS Area
(64 KB)
Lower BIOS Area
(64 KB)
16KBx4
Expansion Card BIOS
and Buffer Area
(128 KB) 16KBx8
Standard PCI/ISA Video
Memory (SMM Mem)
128 KB
Optional Fixed Memory
Hole
DOS Area
(512 KB)
000000h
080000h
07FFFFh
0A0000h
09FFFFh
0C0000h
0BFFFFh
0E0000h
0DFFFFh
0F0000h
0EFFFFh
0FFFFFh
1 MB
960 KB
896 KB
768 KB
640 KB
512 KB
0 KB
AGP Aperture Range
(Base=APBASE Reg. (10h); Dev 0)
(Size=APSIZE Reg. (B4h); Dev 0)
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