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PM73121 Datasheet(PDF) 65 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 65 Page - PMC-Sierra, Inc |
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65 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ • The determination on whether or not the inserted cell should contain a pointer is based on the pointer generation rules defined by ITU-T Recommendation I.363.1. A pointer will be assumed if the queue is structured and the following conditions are met: • The SN is even AND there has been no other pointer in the group of eight cells so far AND (the sequence number = 6 OR the structure ends within the current inserted cell or next cell). • If the queue is in SDF-MF mode and the inserted cell should contain signaling data, the number of payload bytes is adjusted but no signaling information is written to the signaling buffer. Therefore, the old signaling information will be played out. NOTE: In SDF-FR mode, the CES specification states that if the queue contains data for only one DS0, no pointer is used. If a queue is configured in this manner, set R_ CHAN_UNSTRUCT in the R_MAX_BUF word (refer to “R_MAX_BUF Word Format” on page 157). • The value of the payload data depends on the value of INSERT_DATA in R_SN_ CONFIG (refer to “R_SN_CONFIG Word Format” on page 160). The default is to load the value of 0xFF. Other options are to use conditioned data as defined by R_CONDQ_ DATA, old data, or pseudorandom data. If old data is chosen, no data will be written and the old data in the receive buffer will be used. The receive buffer write pointer will be adjusted to the correct location. If the pseudorandom data option is chosen, the data played out will be the value of R_CONDQ_DATA with the MSB replaced by the current value of the pseudorandom number generator x18 + x7 + 1. NOTES: • All DS0s within the replaced cell will use the same algorithm. To minimize the overhead of generating the inserted cells, use the old data option whenever possi- ble. The old data option still needs to do internal processing on a byte-by-byte basis, but since it does not have to write any data, it is about twice as fast as the other options. • The “Fast SN Algorithm” will, under certain situations, allow bad cells to pass through. When this occurs the cells are marked as potentially bad. Any cells marked as bad will not have pointer verification done on them and any signaling data or SRTS information they contain will not be written. However, if these cells should contain pointers or signaling data, adjustments are made to the amount of payload data written so bit integrity is maintained. • The pseudorandom option is not available for UDF-HS mode. The RALP will maintain bit integrity if there is no more than one consecutive errored cells, or if there are up to six lost cells and the queue does not underrun. To maximize the tolerance of the RALP to errored cells, the R_CDVT and R_MAX_BUF values should be increased a little to |
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