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PM73121 Datasheet(PDF) 21 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 21 Page - PMC-Sierra, Inc |
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21 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ NEW FEATURES Changes in the AAL1gator II (PM73121) version from the WAC-021-C-X version are as fol- lows: • After power-up, setting the CMD_REG_ATTN register bit (refer to page 166) causes the device revision register to be loaded with code 121A h. • Supports the “Fast Algorithm” method for processing SNs, as specified in the ITU-T Recommendation I.363.1. • This method maintains bit integrity through any single corrupted cell, single misin- serted cell, or up to six missing cells as determined by the value of the SN and SNP field. However, bit integrity cannot be maintained if an underrun occurs. • If structured cells are used, adjustments for missing or errored pointer cells are consid- ered. Pointer cells will be predicted to be in the cells that should contain pointers as determined by the ITU-T Recommendation I.363.1. • The value of the inserted cells can be FF h, old data, one byte of conditioned data, or pseudorandom data that uses the conditioned data and replaces the MSB with a pseu- dorandom pattern x18 + x7 + 1. The pseudorandom option is not available for UDF-HS mode. The pattern used is selectable on a per-VC basis. • The maximum number of cells, (MAX_INSERT) in the R_SN_CONFIG word (up to six) inserted per queue is programmable on a per-queue basis (refer to “R_SN_CONFIG Word Format” on page 160). • There is a bit, DISABLE_SN in the R_SN_CONFIG register (refer to “R_SN_CONFIG Word Format” on page 160), to optionally disable SN processing for a queue. • A bit has been added to disable the automatic dropping of the first cell received, as would be normally required by ITU-T Recommendation I.363.1 (refer to “NODROP_IN_START” on page 161). • The UTOPIA interface can operate as an SPHY or MPHY device, in addition to its current ATM mode. • When a queue underruns, old data, one byte of conditioned data, or pseudorandom data that uses the conditioned data and replaces the MSB with a pseudorandom pattern (x18 + x7 + 1) will be automatically inserted. The choice is selectable per DS0. Pseudorandom options are not available for UDF-HS mode. • Added the following seven new counters per queue: • number of dropped cells • number of lost cells • number of pointer reframes • number of underruns |
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