Motorola PowerQUICC II MPC8280 Series Reference Manual page 1121

Chapter 32
ATM AAL1 Circuit Emulation Service
The functionality described in this chapter is not available on
the MPC8270.
Refer to www.motorola.com/semiconductors for the latest
RAM microcode packages that support enhancements.
This chapter describes implementation of circuit emulation service (CES) using ATM
adaptation layer type 1 (AAL1) on the MPC8280 and should be used as a supplement to
Chapter 31, "ATM Controller and AAL0, AAL1, and AAL5."
32.1 Features
The AAL1 CES features on the MPC8280 are as follows:
• AAL1
— Reassembly
– Reassembles PDU directly to external memory
– Supports partially filled cells (configurable on a per-VC basis)
– Sequence number (SN) protection (CRC-3 and parity) check
– Implements a 3-step SN algorithm
– Detects and handles lost or misinserted cell
– Maintains bit count integrity (dummy cell insertion)
– Dummy cell contents can be programmed by the user (per FCC)
– Pointer verification in structured AAL1 cell format
– Automatic synchronization using the structured pointer during reassembly
– SRTS (synchronous residual time stamp) gathering on every cycle (8 cells) in
unstructured AAL1
– Statistics gathering on a per-VC basis:
– AAL1 valid cell count
– AAL1 lost cell count
MOTOROLA
Freescale Semiconductor, Inc.
NOTE
Chapter 32. ATM AAL1 Circuit Emulation Service
For More Information On This Product,
Go to: www.freescale.com
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