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參數(shù)資料
| 型號(hào)： | PI7C8154ANAE |
| 廠商： | Pericom |
| 文件頁(yè)數(shù)： | 56/114頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC PCI-PCI BRIDGE ASYNC 304-PBGA |
| 標(biāo)準(zhǔn)包裝： | 27 |
| 系列： | * |
| 應(yīng)用： | * |
| 接口： | * |
| 電源電壓： | * |
| 封裝/外殼： | 304-BBGA |
| 供應(yīng)商設(shè)備封裝： | 304-PBGA（31x31） |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
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PI7C8154A
ASYNCHRONOUS 2-PORT
PCI-to-PCI BRIDGE
Advance Information
Page 46 of 114
DEC 2009 REVISION 1.02
Accordingly, if the ISA enable bit is set, PI7C8154A 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 PI7C8154A 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.
3.3
MEMORY ADDRESS DECODING
PI7C8154A 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
VGA mode
This section describes the first two mechanisms. Section 3.4.1 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 transactions is not predictable. Configure
the memory-mapped I/O base and limit address registers, prefetchable memory base and limit
address registers, and VGA mode bit before setting the memory enable and master enable bits, and
change them subsequently only when the primary and secondary PCI buses are idle.
3.3.1
MEMORY-MAPPED I/O BASE AND LIMIT ADDRESS REGISTERS
Memory-mapped I/O is also referred to as non-prefetchable memory. Memory addresses that
cannot automatically be pre-fetched but that can be conditionally pre-fetched based on command
type should be mapped into this space. Read transactions to non-prefetchable space may exhibit
side effects; this space may have non-memory-like behavior. PI7C8154A prefetches in this space
only if the memory read line or memory read multiple commands are used; transactions using the
memory read command are limited to a single data transfer.
The memory-mapped I/O base address and memory-mapped I/O limit address registers define an
address range that PI7C8154A uses to determine when to forward memory commands. PI7C8154A
forwards a memory transaction from the primary to the secondary interface if the transaction
address falls within the memory-mapped I/O address range. PI7C8154A ignores memory
transactions initiated on the secondary interface that fall into this address range. Any transactions
that fall outside this address range are ignored on the primary interface and are forwarded upstream
from the secondary interface (provided that they do not fall into the prefetchable memory range or
are not forwarded downstream by the VGA mechanism).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PI7C8154ANAE-33 | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 64B/66MHz 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 |
| PI7C8154B | 制造商:PERICOM 制造商全稱:Pericom Semiconductor Corporation 功能描述:2 PORT 64 BIT 66MHZ PCI TO PCI BRIDGE |
| PI7C8154BNA | 制造商:Pericom Semiconductor Corporation 功能描述: |
| PI7C8154BNAE | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 64B/66MHz 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 |
| PI7C8154BNAE-80 | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 64B/66MHz 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 |
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