參數(shù)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(shù): 75/116頁
文件大?。?/td> 533K
代理商: 82443ZX
82443ZX Host Bridge Datasheet
3-51
Register Description
3.4.12
SUBUSN—Subordinate Bus Number Register (Device 1)
Offset:
Default:
Access:
Size:
1Ah
00h
Read /Write
8 bits
This register identifies the subordinate bus (if any) that resides at the level below AGP.This number
is programmed by the PCI configuration software to allow mapping of configuration cycles to
AGP.
3.4.13
SMLT—Secondary Master Latency Timer Register
(Device 1)
Address Offset:
Default Value:
Access:
Size:
1Bh
00h
Read/Write
8 bits
This register control the bus tenure of the 82443ZX on AGP the same way the Device 0 MLT
controls the access to the PCI bus.
3.4.14
IOBASE—I/O Base Address Register (Device 1)
Address Offset:
Default Value:
Access:
Size:
1Ch
F0h
Read/Write
8 bits
This register control the CPU to AGP I/O access routing based on the following formula:
IO_BASE=< address =<IO_LIMIT
Bit
Descriptions
7:0
Bus Number.
Programmable.
Bit
Description
7:3
Secondary MLT Counter Value.
The default is 0s (i.e,. SMLT disabled)
2:0
Reserved.
Bit
Description
7:4
I/O Address Base.
Corresponds to A[15:12] of the I/O address. Default = Fh
3:0
Reserved.
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