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參數(shù)資料
| 型號(hào)： | PM7367-PI |
| 廠商： | PMC-SIERRA INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | DIODE 1N4002 RECTIFYING |
| 中文描述： | DATACOM, FRAMER, PBGA272 |
| 封裝： | 27 X 27 MM, 2.33 MM HEIGHT, PLASTIC, BGA-272 |
| 文件頁(yè)數(shù)： | 63/323頁(yè) |
| 文件大小： | 2429K |
| 代理商： | PM7367-PI |
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DATA SHEET
PM7367 FREEDM-32P32
ISSUE 2
PMC-1991499
FRAME ENGINE AND DATA LINK MANAGER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE
49
initiate a further transaction to write the remaining data when it becomes
available.)
Normally, the GPIC will begin requesting the PCI bus for a write transaction
shortly after data starts to be loaded into the write FIFO by the RMAC or TMAC.
The RMAC, however, is not required to supply a transaction length when writing
packet data and in addition, may insert pauses during the transfer. In the case of
packet data writes by the RMAC, the GPIC will hold off requesting the PCI bus
until the write FIFO has filled up with a number of dwords equal to a
programmable threshold. If the FIFO empties without reaching the end of the
transition, the GPIC will terminate the current transaction and restart a new
transaction to transfer any remaining data when the RMAC signals an end of
transaction. Beginning the PCI transaction before all the data is in the write
FIFO allows the GPIC to reduce the impact of the bus latency on the core
device.
Each master PCI cycle generated by the GPIC can be terminated in three ways:
Completion, Timeout or Master Abort. The normal mode of operation of the GPIC
is to terminate after transferring all the data from the master FIFO selected. As
noted above this may involve multiple PCI accesses because of the inability of
the target to accept the full burst or data starvation during writes. After the
completion of the burst transfer the GPIC will release the bus unless another
FIFO is requesting service, in which case if the GRANT is asserted the GPIC will
insert one idle cycle on the bus and then start a new transfer.
The maximum duration of the a master burst cycle is controlled by the value set
in the LATENCY TIMER register in the GPIC Configuration Register block. This
value is set by the host on boot and is loaded into a counter in the GPIC master
state at the start of each access. If the counter reaches zero and the GRANT
signal has been removed the GPIC will release the bus regardless of whether it
has completed the present burst cycle. This type of termination is referred to as
a Master Time-out. In the case of a Master Time-out the GPIC will remove the
REQUEST signal for two PCI clocks and then reassert it to complete the burst
cycle.
If no target responds to the address placed on the bus by the GPIC after 4 PCI
clocks the GPIC will terminate the cycle and flag the cycle in the PCI Command/
Status Configuration Register as a Master Abort. If the Stop on Error enable
(SOE_E) bit is set in the GPIC Command Register, the GPIC will not process any
more requests until the error condition is cleared. If the SOE_E is not set, the
GPIC will discard the REQUEST and indicate to the local master that the cycle is
complete. This action will result in any write data being lost and any read data
being erroneous.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PM7367 | 32 link, 32 Channel Data Link Manager with PCI Interface |
| PM7375 | ATM SAR and PHY Processor for PCI Bus |
| PM7375-SC | LOCAL ATM SAR & PHYSICAL LAYER |
| PM7380 | FRAME ENGINE AND DATA LINK MANAGER 32P672 |
| PM7380-PI | FRAME ENGINE AND DATA LINK MANAGER 32P672 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PM-737 | 制造商:Eclipse Tools 功能描述: |
| PM7375 | 制造商:PMC 制造商全稱:PMC 功能描述:LOCAL ATM SAR & PHYSICAL LAYER |
| PM7375-SC | 制造商:PMC Sierra from Components Direct 功能描述:PMC-SIERRA PM7375-SC COMMUNICATION MISC - Trays 制造商:PMC-Sierra 功能描述:PMC-Sierra PM7375-SC Communication Misc |
| PM7375-SGC | 制造商:PMC Sierra from Components Direct 功能描述:PM7375-SGC - Trays 制造商:PMC-Sierra 功能描述:PMC-Sierra PM7375-SGC Communication Misc |
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