參數資料
型號: 82443ZX
廠商: INTEL CORP
元件分類: 存儲控制器/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: 74/116頁
文件大?。?/td> 533K
代理商: 82443ZX
Register Description
3-50
82443ZX Host Bridge Datasheet
3.4.9
HDR1—Header Type Register (Device 1)
Offset:
Default:
Access:
Size:
0Eh
01h
Read Only
8 bits
This register identifies the header layout of the configuration space. No physical register exists at
this location.
3.4.10
PBUSN—Primary Bus Number Register (Device 1)
Offset:
Default:
Access:
Size:
18h
00h
Read Only
8 bits
This register identifies that “virtual” PCI-to-PCI bridge is connected to bus #0.
3.4.11
SBUSN—Secondary Bus Number Register (Device 1)
Offset:
Default:
Access:
Size:
19h
00h
Read /Write
8 bits
This register identifies the bus number assigned to the second bus side of the “virtual” PCI-to-PCI
bridge i.e. to AGP. This number is programmed by the PCI configuration software to allow
mapping of configuration cycles to AGP.
Bit
Descriptions
7:0
Header Type (HEADT).
This read only field always returns 01h when read. Writes have no effect.
Bit
Descriptions
7:0
Bus Number.
Hardwired to “0”.
Bit
Descriptions
7:0
Bus Number.
Programmable
Default “0”.
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