參數(shù)資料
型號： PI7C7300
廠商： Pericom Semiconductor Corp.
英文描述： 3-PORT PCI-to-PCI BRIDGE
中文描述： 3端口PCI至PCI橋
文件頁數(shù)： 46/109頁
文件大?。?/td> 779K
代理商： PI7C7300
PI7C7300A
3-PORT PCI-TO-PCI BRIDGE
ADVANCE INFORMATION
Page 46 OF 109
09/25/03 Revision 1.09
When a VGA-compatible device exists downstream from PI7C7300A, set the VGA
mode bit in the bridge control register in configuration space to enable VGA mode.
When PI7C7300A is operating in VGA mode, it forwards downstream those transactions
addressing the VGA frame buffer memory and VGA I/O registers, regardless of the
values of the base and limit address registers. PI7C7300A ignores transactions initiated
on the secondary interface addressing these locations.
The VGA frame buffer consists of the following memory address range:
000A 0000h–000B FFFFh
Read transactions to frame buffer memory are treated as non-prefetchable. PI7C7300A
requests only a single data transfer from the target, and read byte enable bits are
forwarded to the target bus.
The VGA I/O addresses are in the range of 3B0h–3BBh and 3C0h–3DFh I/O. These I/O
addresses are aliases every 1KB throughout the first 64KB of I/O space. This means that
address bits <15:10> are not decoded and can be any value, while address bits [31:16]
must be all 0s. VGA BIOS addresses starting at C0000h are not decoded in VGA mode.
5.4.2
VGA SNOOP MODE
PI7C7300A provides VGA snoop mode, allowing for VGA palette write transactions to
be forwarded downstream. This mode is used when a graphics device downstream from
PI7C7300A needs to snoop or respond to VGA palette write transactions. To enable the
mode, set the VGA snoop bit in the command register in configuration space. Note that
PI7C7300A claims VGA palette write transactions by asserting DEVSEL# in VGA
snoop mode.
When VGA snoop bit is set, PI7C7300A forwards downstream transactions within the
3C6h, 3C8h and 3C9h I/O addresses space. Note that these addresses are also forwarded
as part of the VGA compatibility mode previously described. Again, address bits
<15:10> are not decoded, while address bits <31:16> must be equal to 0, which means
that these addresses are aliases every 1KB throughout the first 64KB of I/O space.
Note:
If both the VGA mode bit and the VGA snoop bit are set, PI7C7300A behaves in
the same way as if only the VGA mode bit were set.
6
TRANSACTION ORDERING
To maintain data coherency and consistency, PI7C7300A complies with the ordering
rules set forth in the
PCI Local Bus Specification
,
Revision 2.2
, for transactions crossing
the bridge. This chapter describes the ordering rules that control transaction forwarding
across PI7C7300A.
6.1
TRANSACTIONS GOVERNED BY ORDERING RULES
Ordering relationships are established for the following classes of transactions crossing
PI7C7300A:
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PI7C7300A 制造商:PERICOM 制造商全稱:Pericom Semiconductor Corporation 功能描述:3-PORT PCI-to-PCI BRIDGE
PI7C7300AEVB-3 功能描述:界面開發(fā)工具 3 Port PCI Bridge Eval Brd RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
PI7C7300ANA 制造商:Pericom Semiconductor Corporation 功能描述:PCI-to-PCI Bridge 272-Pin BGA 制造商:Pericom Semiconductor Corporation 功能描述:PCI to PCI Bridge 272-Pin BGA
PI7C7300ANAE 功能描述:外圍驅(qū)動器與原件 - PCI 3 Port PCI Bridge RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
PI7C7300ANA-E 制造商:Pericom Semiconductor Corporation 功能描述:PCI-to-PCI Bridge 272-Pin BGA 制造商:Pericom Semiconductor Corporation 功能描述:PCI to PCI Bridge 272-Pin BGA
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