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参数资料
| 型号： | PI7C8154BNAE |
| 厂商： | Pericom |
| 文件页数： | 45/114页 |
| 文件大小： | 0K |
| 描述： | IC PCI-PCI BRIDGE ASYNC 304-PBGA |
| 标准包装： | 27 |
| 系列： | * |
| 应用： | * |
| 接口： | * |
| 电源电压： | * |
| 封装/外壳： | 304-BBGA |
| 供应商设备封装： | 304-PBGA（31x31） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
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PI7C8154B
ASYNCHRONOUS 2-PORT
PCI-to-PCI BRIDGE
Advance Information
Page 36 of 112
JUNE 2008 REVISION 1.1
2.9.3
64-BIT TRANSACTIONS – DATA PHASE
PI7C8154B asserts REQ64# to indicate it is initiating a 64-bit transfer during memory write
transactions. During the data phase, PI7C8154B asserts the following:
The low 32 bits of data on AD[31:0]
The low 4 bits on CBE[3:0]
The high 32 bits of data on AD[63:32]
The high 4 bits on CBE[7:4]
Every data phase will consist of 64 bits and 8 byte enable bits when PI7C8154B detects ACK64##
asserted by the target at the same time it detects DEVSEL#.
For write transactions, PI7C8154B redirects the write data that it has on the AD[63:32] bus to
AD[31:0] during the second data phase if it does not detect ACK64# asserted at the same time that
it detects DEVSEL# asserted. Also, the CBE[7:4] is redirected to CBE[3:0] during the second data
phase.
For 64-bit memory write transactions that end at an odd DWORD boundary, PI7C8154B drives the
byte enable bits to 1 during the last data phase. AD[63:32] are then unpredictable but are driven to
a valid logic level.
For read transactions, PI7C8154B drives 8 bits of byte enables on CBE[7:0] when it has asserted
REQ64#. CBE[7:0] is always 0 because the only read transactions that use the 64-bit extension are
prefetchable memory reads. No special redirection is needed based on the target’s assertion or lack
of assertion of ACK64#. When the target asserts ACK64# at the same time that it asserts
DEVSEL#, all read data transfers consist of 64 bits and the target asserts PAR64, which covers
AD[63:32] and CBE[7:4]. All data phase consist of 32-bit transactions when the target does not
assert ACK64# and asserts DEVSEL#.
2.9.4
64-BIT TRANSACTIONS – RECEIVED BY PI7C8154B
PI7C8154B does one of 2 things when it is the target of a transaction and REQ64# is asserted.
PI7C8154B either asserts ACK64# at the same time it asserts DEVSEL# to indicate its ability to
perform 64-bit data transfers, or it does not use the 64-bit extension as a target and does not assert
ACK64#. PI7C8154B does not assert ACK64# under any of the following conditions:
REQ64# was not asserted by the initiator
PI7C8154B is responding to a non-prefetchable memory read transaction
PI7C8154B is responding to an I/O transaction
PI7C8154B is responding to a configuration transaction
Only 1 DWORD of data was read from the target
If PI7C8154B is the target of a 64-bit memory write transaction, it is able to accept 64 bits of data
during each data phase. If PI7C8154B is the target of a memory read transaction, it delivers 64 bits
of read data during each data phase and drives PAR64 corresponding to AD[63:32] and CBE[7:4]
for each data phase. If an odd number of DWORDS is read from the target and PI7C8154B has
asserted ACK64# when returning read data to the initiator, PI7C8154B disconnects before the last
DWORD is returned. PI7C8154B may have read an odd number of DWORD’s because of either a
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相关代理商/技术参数 |
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|---|---|
| PI7C8154BNAE-80 | 功能描述:外围驱动器与原件 - PCI 64B/66MHz 2 Port PCI Bridge RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| PI7C8154BNAI | 制造商:Pericom Semiconductor Corporation 功能描述: |
| PI7C8154BNAIE | 功能描述:外围驱动器与原件 - PCI 64B/66MHz 2 Port PCI Bridge RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| PI7C8154EVB | 功能描述:界面开发工具 64B/66MHz 2 Port PCI Bridge Eval Brd RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| PI7C8154NA-33 | 制造商:PERICOM 功能描述: |
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