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PM73121 Datasheet(PDF) 57 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 57 Page - PMC-Sierra, Inc |
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57 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ no pointer, set T_CHAN_UNSTRUCT = 1 in the QUEUE_CONFIG word of the T_QUEUE_ TBL. 4. The TALP fills the rest of the cell payload with data and/or signaling information. The T_ CHAN_ALLOC table (refer to section 7.6.8 “T_QUEUE_TBL” on page 134) determines which channels are dedicated to which queue. If a bit is set, the channel represented by that bit is assigned to that queue. The TALP successively writes the data from the marked channels into the UTOPIA interface. A queue-based parameter, BYTES_PER_CELL, decides when enough payload bytes have been obtained. If this number is fewer than 47, then the remaining bytes for the cell are loaded with P_FILL_CHAR. This implies that because of the presence of the structure pointer, the number of fill bytes will not be constant for structured data queues. 5. The structure used for signaling is determined by the mode of the line and the value of E1_WITH_T1_SIG. Normally the signaling structure will follow the mode of the line. However, if the line is in E1 mode and E1_WITH_T1_SIG is set, then a T1 signaling structure is used. This means that for a single DS0, signaling is inserted after 24 data bytes instead of after 16 data bytes. If data is to be sent from the data queue, this process continues byte-by-byte while updating pointers and counters until one of the following occurs: • The cell is complete. • The last data byte for the last frame of the multiframe has been set. 6. When signaling information is to be sent, data is obtained from the signaling locations of the multiframe, with the help of the channel allocation table (T_CHAN_ALLOC). This process proceeds byte-by-byte until one of the following occurs: • The cell is complete. • All signaling nibbles for all channels assigned to the queue have been sent. |
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