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MPC8280 Datasheet(PDF) 1109 Page - Freescale Semiconductor, Inc |
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MPC8280 Datasheet(HTML) 1109 Page - Freescale Semiconductor, Inc |
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1109 / 1386 page  ATM AAL2 MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 Freescale Semiconductor 33-3 Figure 33-3. AAL2 Switching Example 33.2 Features The MPC8280’s AAL2 features are as follows: • Fully complies with ITU-T I.363.2 (09/97 and 11/00) and ITU-T I.366.1 (06/98) specifications. • Number of AAL2 external channels supported is subject to internal memory constraints — Each external channel requires space for one Transmit Queue Descriptor in internal memory. Typically, up to 1000 external channels can be supported. • Supports CBR, VBR and UBR+ traffic types — PCR pacing (with optional Timer_CU) — VBR pacing (with optional Timer_CU) — UBR+ pacing (no Timer_CU support) • Priority mechanism for transmitting per VC. The priority mechanism provides for TX queues having equal or differing priorities. The SSSAR TX queues can be prioritized flexibly among the CPS TX queues. • Timer_CU support • NoSTF mode support • Support for partially filled cells • User-defined cells (as described in Section 31.7, “User-Defined Cells (UDC)”). • Interrupt indications include the ATM channel number, the CID, and the event type. The events reported are TX buffer not ready, TX buffer transmitted, RX buffer not ready, RX buffer, RX SSSAR frame, and RX AAL2 error events. • CPS switching — Switching from a receive PHY1 | VP1 | VC1 | CID1 combination to another transmit PHY2 | VP2 | VC2 | CID2 combination — Partial packet discard support — For each switched queue, a counter for the total number of packets in the queue is available. • CPS Receiver — Segmentation of CPS PDU directly to external memory queues X VP=5|VC=20|CID=13 VP=27|VC=3|CID=212 UTOPIA PHY4 UTOPIA PHY7 |
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