MPC8280 datasheet(961/1386 Pages) FREESCALE

961 / 1386 page

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-1

Chapter 31

ATM Controller and

AAL0, AAL1, and AAL5

NOTE

The functionality described in this chapter is not available on the MPC8270.

The ATM controller provides the ATM and AAL layers of the ATM protocol using the universal test and

operations physical layer (PHY) interface for ATM (UTOPIA level II) for both master and slave modes. It

performs segmentation and reassembly (SAR) functions of AAL5, AAL1 circuit emulation service (CES),

AAL2, and AAL0, and most of the common parts of the convergence sublayer (CP-CS) of these protocols.

For each virtual channel (VC), the controller’s ATM pace control (APC) unit generates a cell transmission

rate to implement constant bit rate (CBR), variable bit rate (VBR), available bit rate (ABR), unspecified

bit rate (UBR) or UBR+ traffic. To regulate VBR traffic, the APC unit performs a continuous-state leaky

bucket algorithm. The APC unit also uses up to eight priority levels to prioritize real-time ATM channels,

such as CBR and real-time VBR, over non-real-time ATM channels such as VBR, ABR and UBR.

The ATM controller performs the ATM Forum (UNI-4.0) ABR flow control. To perform feedback rate

adaptation, it supports forward and backward resource management (RM) cell generation and ATM Forum

floating-point calculation. ABR flow control is implemented in hardware and firmware (without software

intervention) to prevent potential delays during backward RM cell processing and feedback rate

adaptation.

The MPC8280 supports a special mode for ATM/TDM interworking. The CPM performs automatic data

forwarding between ATM channels and the MCCs’ TDM channels without core intervention.

The MPC8280 ATM SAR controller applications are as follows:

•

ATM line card controllers

•

ATM-to-WAN interworking (frame relay, T1/E1 circuit emulation)

•

Residential broadband network interface units (NIU) (ATM-to-Ethernet)

•

High-performance ATM network interface cards (NIC)

•

Bridges and routers with ATM interface

31.1

Features

The ATM controller has the following features:

•

Full duplex segmentation and reassembly at 155 Mbps

•

UTOPIA level II master and slave modes 8/16 bit

•

AAL5, AAL1, AAL2, AAL0 protocols

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