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參數(shù)資料
| 型號(hào)： | PI7C7300NA |
| 廠商： | PERICOM SEMICONDUCTOR CORP |
| 元件分類： | 總線控制器 |
| 英文描述： | PCI BUS CONTROLLER, PBGA272 |
| 封裝： | PLASTIC, BGA-272 |
| 文件頁數(shù)： | 91/119頁 |
| 文件大小： | 880K |
| 代理商： | PI7C7300NA |
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PI7C7300
3-PORT PCI-to-PCI BRIDGE
Advanced Information
63
06/04/02 Revision 1.07
14.1.2
Device ID Register – Offset 00h
Configuration Register 1
Bit
Function
Type
Description
31:16
Device ID
R/O
Identifies this device as the PI7C7300. Hardwired as 71E2h.
Configuration Register 2
Bit
Function
Type
Description
31:16
Device ID
R/O
Identifies this device as the PI7C7300. Hardwired as 71E3h.
14.1.3
Command Register – Offset 04h
Bit
Function
Type
Description
0
I/O Space
Enable
R/W
Controls response to I/O access on the primary interface
0: ignore I/O transactions on the primary interface
1: enable response to I/O transactions on the primary
interface
Reset to 0
1
Memory Space
Enable
R/W
Controls response to memory accesses on the primary
interface
0: ignore memory transactions on the primary interface
1: enable response to memory transactions on the primary
interface
Reset to 0
2
Bus Master
Enable
R/W
Controls ability to operate as a bus master on the primary
interface
0: do not initiate memory or I/O transactions on the primary
interface and disable response to memory and I/O
transactions on secondary 1 interface
1: enables 7C7300 to operate as a master on the primary
interfaces for memory and I/O transactions forwarded from
the secondary interface
Reset to 0
3
Special Cycle
Enable
R/O
No special cycles defined.
Bit is defined as read only and returns 0 when read
4
Memory Write
And Invalidate
Enable
R/O
Memory write and invalidate not supported.
Bit is implemented as read only and returns 0 when read
(unless forwarding a transaction for another master)
5
VGA Palette
Snoop Enable
R/W
Controls response to VGA compatible palette accesses
0: ignore VGA palette accesses on the primary
1: enable positive decoding response to VGA palette writes
on the primary interface with I/O address bits AD[9:0] equal
to 3C6h, 3C8h, and 3C9h (inclusive of ISA alias; AD[15:10]
are not decoded and may be any value)
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