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PM73121 Datasheet(PDF) 70 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 70 Page - PMC-Sierra, Inc |
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70 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ of external memory are allocated for receive queues. Since there are eight lines, each line is allo- cated 16 kBytes of memory. This provides for 32 multiframes of E1 data (16 multiframes if T1 signaling is used) or 16 multiframes of T1 data. The queues are used in a wrap-around fashion. Read and write pointers are used at the frame and multiframe level to access the receive queue. Figure 34 on page 53 shows cell reception. Read and write pointers are used at the frame and mul- tiframe level to access the correct data byte location. The RALP writes sequential cell data bytes into successive DS0 locations assigned to that queue. When the RALP encounters signaling bytes, it places them in the receive signaling buffer. The buffers are organized in a multiframe format. There is one signaling nibble per multiframe allo- cated to each DS0 channel. Therefore, 32 bytes of signaling storage are allocated for each multi- frame worth of data buffer. Figure 34 and the figures that follow illustrate these points and identify how different data formats are stored in the data and signaling buffers. The RALP determines channels by reading from the R_CHAN_ALLOC table and then storing the data in the corresponding timeslots of successive frame buffers in the R_DATA_BUFFER. Figure 34. Cell Reception 511 0 . . . . . . . . RFTC Frames 31 0 Channel RALP reassembles bytes from the cell. In this case, into DS0s 17 and 21. R_DATA_BUFFER 17 21 22 21 20 19 18 17 |
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