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PM73121 Datasheet(PDF) 69 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 69 Page - PMC-Sierra, Inc |
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69 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ If the cell is accepted, the RALP then transfers the cell to the external memory using the R_ CHAN_ALLOC fields in the R_QUEUE_TBL. Figure 32 shows this receive cell process. If a valid cell is not received in time, the queue may enter an underrun condition. The CDVT value allows the receiver to be configured to store a variable amount of data for that queue before data is emitted. This storage permits the cells to arrive with variable delays without causing errors on the line outputs. This CDVT value is used when the first cell is received after an underrun. The AAL1gator II also provides protection from buffer overrun and pointer misalign- ment. The RALP reads the ATM cell from the RUTOPIA FIFO, verifies the header, and determines the queue to which the cell belongs. It then locates the data bytes of the cell and writes them into frame buffers provided for that line. Receive queues exist in the external memory, and 128 kBytes Figure 33. Receive Cell Processing Wait for a cell in the receive UTOPIA FIFO. Is the cell a data cell? No Check CRC-10 and place cell in OAM queue. Yes Is SNP correct? Correct SN/SNP as specified in ITU-T Recommendation I.363.1 (refer to Appendix B “References” on page 203). Able to correct Is SN correct? No Yes Place data and signaling in appropriate timeslots and update write pointers. Accept/drop cell as specified in ITU-T Recommendation I.363.1 “Fast SN Algorithm” (refer to Appendix B “References” on page 203). Drop Accept Unable to correct No |
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