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MT92220 Datasheet(PDF) 82 Page - Zarlink Semiconductor Inc |
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MT92220 Datasheet(HTML) 82 Page - Zarlink Semiconductor Inc |
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82 / 210 page  Data Sheet MT92220 82 Zarlink Semiconductor Inc. One of the most important characteristics of the generation of AAL2 packets is that it uses the bus timestamp to synchronize and generate the sequence number within the UUI. This has many advantages, notably deterministic behavior of the sequence numbers and the synchronization of different channels' sequence numbers together, allowing completely synchronized transport of several voice channels across many AAL2 connections. The UUI sequence number is extracted by dividing the current timestamp by the Sequence Number Interval, then performing a modulo by the total sequence number sequence size. For example, if the Sequence Number Interval is 40 frames and 4 sequence number bits are used, the operation is (timestamp / 40) % (2^4). These operation must also take into account the fact that the timestamp can wrap: the Timestamp Remainder and Timestamp Wrap Inc fields take care of that. Timestamp Wrap Inc must be programmed to: 232 % ((Sequence Number Interval * (2Num Seq Bits). The format of the TX AAL2 connection structure is the following: Figure 47 - TX AAL2 Connection Structure b8 b9 b10 b11 b12 b13 b14 b15 +0 b0 b1 b2 b3 b4 b5 b6 b7 +2 +A +10 +12 +14 Transmitted Packet Count [15:0] +6 +4 +8 +16 +18 Transmitted Octet Count [31:16] Transmitted Octet Count [15:0] +1A +1C TX AAL2 VC Structure Base Address [20:5] +1E +20 +22 +24 +C +E +26 AAL2 CID [7:0] |
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