參數(shù)資料
型號: FW82815
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù): 99/172頁
文件大?。?/td> 795K
代理商: FW82815
82815 GMCH
R
Datasheet
99
3.5.21.
BCTRL—PCI-PCI Bridge Control Register (Device 1)
Address Offset:
3Eh
Default:
00h
Access:
Read/Write
Size
8 bits
This register provides extensions to the PCICMD1 register that are specific to PCI-PCI bridges. The
BCTRL provides additional control for the secondary interface (i.e., PCI1/AGP) as well as some bits that
affect the overall behavior of the “virtual” PCI-PCI bridge embedded in GMCH (e.g., VGA compatible
address ranges mapping).
7
6
5
4
3
2
1
0
FB2B EN
Sec Bus
Reset
Reserved
Reserved
VGA EN
SERR#
EN
Parity Err
Response
EN
Bit
Description
7
Fast Back to Back Enable.
Hardwired to 0.
Since there is only one target allowed on AGP, this bit is
meaningless.
6
Secondary Bus Reset.
Hardwired to 0. The
GMCH does not support generation of reset via this bit on
the AGP. Note that the only way to perform a hard reset of the AGP is via the system reset, either
initiated by software or hardware via the I/O Controller Hub.
5
Master Abort Mode.
Hardwired to 0.
This means that when acting as a master on AGP/PCI1, the
GMCH will drop writes on the “floor” and return all 1s during reads when a Master Abort occurs.
4
Reserved.
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