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參數(shù)資料
| 型號： | PI7C8150A-33 |
| 英文描述： | PCI Bridge | 2-Port PCI-to-PCI Bridge |
| 中文描述： | PCI橋| 2端口PCI至PCI橋 |
| 文件頁數(shù)： | 45/115頁 |
| 文件大?。?/td> | 879K |
| 代理商： | PI7C8150A-33 |
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PI7C8150B
2-PORT PCI-TO-PCI BRIDGE
ADVANCE INFORMATION
Page 45 of 115
July 31, 2003 – Revision 1.031
Note:
The initial states of the I/O base and I/O limit address registers define an I/O range
of 0000 0000h to 0000 0FFFh, which is the bottom 4KB of I/O space. Write these registers
with their appropriate values before setting either the I/O enable bit or the master enable bit
in the command register in configuration space.
4.2.2
ISA MODE
PI7C8150B supports ISA mode by providing an ISA enable bit in the bridge control
register in configuration space. ISA mode modifies the response of PI7C8150B inside the
I/O address range in order to support mapping of I/O space in the presence of an ISA bus in
the system. This bit only affects the response of PI7C8150B when the transaction falls
inside the address range defined by the I/O base and limit address registers, and only when
this address also falls inside the first 64KB of I/O space (address bits [31:16] are 0000h).
When the ISA enable bit is set, PI7C8150B does not forward downstream any I/O
transactions addressing the top 768 bytes of each aligned 1KB block. Only those
transactions addressing the bottom 256 bytes of an aligned 1KB block inside the base and
limit I/O address range are forwarded downstream. Transactions above the 64KB I/O
address boundary are forwarded as defined by the address range defined by the I/O base
and limit registers.
Accordingly, if the ISA enable bit is set, PI7C8150B forwards upstream those I/O
transactions addressing the top 768 bytes of each aligned 1KB block within the first 64KB
of I/O space. The master enable bit in the command configuration register must also be set
to enable upstream forwarding. All other I/O transactions initiated on the secondary bus are
forwarded upstream only if they fall outside the I/O address range.
When the ISA enable bit is set, devices downstream of PI7C8150B can have I/O space
mapped into the first 256 bytes of each 1KB chunk below the 64KB boundary, or anywhere
in I/O space above the 64KB boundary.
4.3
MEMORY ADDRESS DECODING
PI7C8150B has three mechanisms for defining memory address ranges for forwarding of
memory transactions:
!
Memory-mapped I/O base and limit address registers
!
Prefetchable memory base and limit address registers
!
This section describes the first two mechanisms. Section 4.4.1 describes VGA mode. To
enable downstream forwarding of memory transactions, the memory enable bit must be set
in the command register in configuration space. To enable upstream forwarding of memory
transactions, the master-enable bit must be set in the command register. The master-enable
bit also allows upstream forwarding of I/O transactions if it is set.
CAUTION
If any configuration state affecting memory transaction forwarding is changed by a
configuration write operation on the primary bus at the same time that memory
transactions are ongoing on the secondary bus, response to the secondary bus memory
VGA mode
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PI7C8150B | PCI Bridge | Asynchronous 2-Port PCI Bridge |
| PI7C8152A | ENHANCED 2- PORT TO PCI BRIDGE INTEL 21152 COMPORISON |
| PI7C81552 | ENHANCED 2-PORT PCI TO PCI BRIDGE INTEL 21152 COMPARISON |
| PI7C81552A | ENHANCED 2-PORT PCI TO PCI BRIDGE INTEL 21152 COMPARISON |
| PI7C8152 | ENHANCED 2- PORT TO PCI BRIDGE INTEL 21152 COMPORISON |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PI7C8150AMA | 制造商:Pericom Semiconductor Corporation 功能描述:PCI to PCI Bridge 208-Pin FQFP |
| PI7C8150AMA-33 | 制造商:Pericom Semiconductor Corporation 功能描述:PCI-to-PCI Bridge 208-Pin FQFP |
| PI7C8150AMAE | 功能描述:外圍驅(qū)動器與原件 - PCI 2 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 |
| PI7C8150AMAE-33 | 功能描述:外圍驅(qū)動器與原件 - PCI 2 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 |
| PI7C8150AND | 制造商:PERICOM 制造商全稱:Pericom Semiconductor Corporation 功能描述:2-PORT PCI-to-PCI BRIDGE |
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