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PM73121 Datasheet(PDF) 64 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 64 Page - PMC-Sierra, Inc |
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64 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ by the microprocessor. The tail pointer is the address of the last cell of the queue, and is main- tained by the RALP. The RALP updates the tail pointer upon each OAM cell arrival. Figure 31 shows the interpretation of the incoming cell header. If SHIFT_VCI = 0, cells received with VCI(8) = 1 and PTI = 0 to 3 are interpreted as data cells and are sent to the queue with VCI(7:0). Bits 7:5 determine the line, and bits 4:0 determine the queue. The receiver ignores VCI(15:9) and VPI(11:0). If SHIFT_VCI = 1, the interpretation of the VCI bits is shifted by four bits. When the cell is a data cell, the RALP verifies the SN CRC. If the SN CRC does not verify, the RALP attempts to correct it as specified in ITU-T Recommendation I.363.1 and increments the R_INCORRECT_SNP counter (refer to “R_INCORRECT_SNP Word Format” on page 158). If the RALP cannot correct the cell, it identifies the cell as invalid. If the DISABLE_SN bit (refer to “DISABLE_SN” on page 160) has not been set for this queue, then sequence number processing is done in accordance with the “Fast SN Algorithm” described in ITU-T Recommendation I.363.1. Based on the value of the current SN and SNP and the previ- ous SN and SNP, the RALP either accepts the current cell, drops the current cell, or accepts the current cell and inserts cells. Inserted cells have the following properties: • If the queue is in an unstructured mode or if the queue is in structured mode and the inserted cell should not contain a pointer, each inserted cell contains the number of payload bytes as determined by R_BYTES_CELL in R_MP_CONFIG (refer to “R_MP_ CONFIG Word Format” on page 155). • If the queue is in a structured mode and the inserted cell should contain a pointer and R_ BYTES_CELL is equal to 47, then the inserted cell contains 46 payload bytes. • If the queue is in a structured mode and the inserted cell should contain a pointer and R_ BYTES_CELL is less than 47, then the inserted cell contains R_BYTES_CELL payload bytes. Figure 31. Cell Header Interpretation 15 14 13 12 11 10 9876 543210 Queue MOD 32 Line Ignored Ignored VCI Data 11 10 987654 3210 Ignored 11 10 98765 43210 Ignored 15 14 13 12 11 10 987654 3210 Ignored Queue MOD 32 Line SHIFT_VCI = 0 VPI VCI SHIFT_VCI = 1 VPI Data |
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