參數(shù)資料
型號(hào)： MT90883
廠(chǎng)商： Zarlink Semiconductor Inc.
英文描述： TDM to Packet Processors
中文描述： TDM到分組處理器
文件頁(yè)數(shù)： 39/97頁(yè)
文件大?。?/td> 702K
代理商： MT90883
MT90880/1/2/3
Data Sheet
39
Zarlink Semiconductor Inc.
5.5.4 Context Removal
Context removal is required when all active channels are removed from a context. Normally, channel deletion is
signalled in the first packet of the modified context. However, when the last channel is deleted from a context,
no packet will be transmitted since there is no payload. Therefore the receiver will not be signalled that the
channel deletion has taken place, and the context will underrun, waiting for further packets to arrive.
Therefore, it is not permitted to tear down a context simply by deleting all of its contents. Table 5 below
describes the context removal procedure, known as "context teardown", used to allow contexts to be deleted
cleanly.
Table 17 - Context Teardown Process
5.5.5 Context Cleardown
A second means of context removal, known as "context cleardown", is provided for situations where a system
error has occurred, and the context has not been removed properly. The cleardown mechanism prevents
expired contexts from using up system resources and memory.
For example, during context teardown, if the last packet sent by the PTX is not received by the PRX, the context
will still exist at the PRX when it has already been deleted by the PTX. In this situation, a timeout informs the
PRX Host that the context teardown notified by the PTX Host has not taken place.
The PRX host then needs to take two actions:
1. Instruct the queue manager to flush the queue of packets for this context. Following this, the queue manager will
discard any packets that arrive using the same context identifier.
2. Program a context cleardown, which immediately clears any state associated with the context.
Packet Transmit End (PTX)
Packet Receive End (PRX)
1
PTX Host signals PRX Host to expect a context
removal or "teardown"
2
PRX Host programs MT9088x device to expect a
context teardown.
3
PRX Host sends an acknowledgement back to the
PTX Host.
4
PTX host activates the context teardown.
5
The next new packet is the last one to be transmitted
for this context.
The context switch bit in the header is toggled to
signal the context removal.
6
Last packet received for the context to be removed,
identified by the toggling of the context switch bit.
This automatically activates the previously
programmed context teardown.
7
The PRX Queue manager discards any future
packets that arrive with the same context ID.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT90883A 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors
MT90883A/IG 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors
MT90883BP1N 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors
MT90883IG 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors
MT9088IG 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors
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