MPC8280 datasheet(40/1386 Pages) FREESCALE

40 / 1386 page

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

Contents

Paragraph

Number

Title

Page

Number

33.6

User-Defined Cells in AAL2 ....................................................................................... 33-37

33.7

AAL2 Exceptions ........................................................................................................ 33-38

Chapter 34

Inverse Multiplexing for ATM (IMA)

34.1

Features .......................................................................................................................... 34-1

34.1.1

References.................................................................................................................. 34-3

34.1.2

IMA Versions Supported ........................................................................................... 34-3

34.1.3

MPC8280 Versions Supported................................................................................... 34-3

34.1.4

PHY-Layer Devices Supported.................................................................................. 34-4

34.1.5

ATM Features Not Supported .................................................................................... 34-4

34.1.6

Additional Impact on MPC8280 Features ................................................................. 34-4

34.2

IMA Protocol Overview ............................................................................................... 34-4

34.2.1

Introduction................................................................................................................ 34-4

34.2.2

IMA Frame Overview................................................................................................ 34-5

34.2.3

Overview of IMA Cells ............................................................................................. 34-7

34.2.3.1

IMA Control Cells ................................................................................................. 34-7

34.2.3.2

IMA Filler Cells..................................................................................................... 34-8

34.3

IMA Microcode Architecture ........................................................................................ 34-8

34.3.1

IMA Function Partitioning......................................................................................... 34-8

34.3.1.1

User Plane Functions Performed by Microcode .................................................... 34-9

34.3.1.2

Plane Management Functions Performed by Microcode....................................... 34-9

34.3.2

Transmit Architecture ................................................................................................ 34-9

34.3.2.1

TRL Operation..................................................................................................... 34-10

34.3.2.1.1

TRL Service Latency....................................................................................... 34-11

34.3.2.2

Non-TRL Operation............................................................................................. 34-11

34.3.2.3

Transmit Queue Operation Examples (ITC mode).............................................. 34-12

34.3.2.4

Differences in CTC Operation ............................................................................. 34-14

34.3.3

Receive Architecture................................................................................................ 34-15

34.3.3.1

Cell Reception Task ............................................................................................. 34-15

34.3.3.2

Cell Processing Activation Function ................................................................... 34-18

34.3.3.2.1

On-Demand Cell Processing ........................................................................... 34-18

34.3.3.2.2

IDCR-Regulated Cell Processing .................................................................... 34-19

34.3.3.3

Cell Processing Task............................................................................................ 34-20

34.4

IMA Programming Model ........................................................................................... 34-20

34.4.1

Data Structure Organization .................................................................................... 34-20

34.4.2

IMA FCC Programming .......................................................................................... 34-22

34.4.2.1

FCC Registers ..................................................................................................... 34-22

34.4.2.1.1

FPSMRx .......................................................................................................... 34-22

34.4.2.1.2

FTIRRx ............................................................................................................ 34-22

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