參數(shù)資料
型號(hào): L64360
廠商: LSI Corporation
英文描述: Highly Integrated ATM Segmentation and Reassembly (SAR) Engine optimized for internetworking applications(用于優(yōu)化網(wǎng)絡(luò)的高度集成的異步傳輸模式-分段和重組處理芯片)
中文描述: 高度集成的自動(dòng)柜員機(jī)分段和重組(SAR)的網(wǎng)絡(luò)應(yīng)用(用于優(yōu)化網(wǎng)絡(luò)的高度集成的異步傳輸模式-分段和重組處理芯片優(yōu)化引擎)
文件頁(yè)數(shù): 138/232頁(yè)
文件大小: 1389K
代理商: L64360
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12-6
Operation
Segmentation
The event that triggers a segmentation process can be generated when one
or more of the Peak Rate Pacing Counters elapse or by a predefined mes-
saging system with the Host processor. For AAL 1 datastreams, the APU
can poll a memory map register for a Ready to Segment Flag to be set by
anexternaldevicesuchasaDS1terminationdevice.Inthisdiscussion,the
Peak Rate Pacing Counters are used as the segmentation triggering
mechanism.
The Peak Rate Pacing Counters can be used to index a link list of pointers.
These pointers point to a data structure describing the particular CS-PDU
to be segmented. When one or more counters elapse, the APU can be inter-
rupted and the firmware should vector into the segmentation routine. The
first task for the segmentation routine is to use the counter and index a par-
ticular link list. The APU can implement a priority mechanism to select
which CS-PDU will be segmented first.
The data structure to describe a CS-PDU for segmentation process is
slightlydifferentcomparedtothedatastructureforthereassemblyprocess
described in the previous subsection. The data structure for segmentation
contains information such as the ATM Header, the CRC32 Partial Value
for AAL 5, the current Host memory address pointing to the SAR-SDU to
be transferred, and the transfer count. Other useful control information
such as the maximum burst size and priority can be included in the data
structure. The maximum burst size can be used to inform the APU to trans-
fer multiple SAR-SDUs from the Host memory into the cell buffer mem-
ory for segmentation.
For AAL 5 CS-PDU, the CPU needs to initialize the CRC32 circuitry with
the CRC32 Partial Value before the transfer begins. Once the SAR-SDU is
in the cell buffer memory, the APU needs to generate the cell header. The
cell header is retrieved from the data structure and the APU may process
someofthefields,suchastheVCI,theVPI,theGFC,theCLP,andthePT.
For AAL 3/4, the APU must also generate the SAR Header and Trailer.
The SAR Header and Trailer from the previous SAR-SDU can also be
stored in the data structure. The APU may need to manipulate some of the
field such as incrementing the SN Field. When the cell is ready for trans-
mission, the APU informs the ACI to fetch the cell from the cell buffer
memory and passes it to the TCS. The HEC can be inserted dynamically
during the transmission. Depending on the physical layer used, the HEC
generation circuitry is programmable and is capable to insert or skip the
HEC Field.
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