MPC8280 datasheet(38/1386 Pages) FREESCALE

38 / 1386 page

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

xxxviii

Freescale Semiconductor

Contents

Paragraph

Number

Title

Page

Number

Chapter 32

ATM AAL1 Circuit Emulation Service

32.1

Features .......................................................................................................................... 32-1

32.2

AAL1 CES Transmitter Overview................................................................................. 32-3

32.2.1

Data Path.................................................................................................................... 32-3

32.2.2

Signaling Path ............................................................................................................ 32-3

32.3

AAL1 CES Receiver Overview ..................................................................................... 32-4

32.4

Interworking Functions.................................................................................................. 32-6

32.4.1

Automatic Data Forwarding ...................................................................................... 32-6

32.4.1.1

ATM-to-TDM ........................................................................................................ 32-7

32.4.1.2

TDM-to-ATM ........................................................................................................ 32-7

32.4.2

Timing Issues ............................................................................................................. 32-8

32.4.3

Clock Synchronization (SRTS, Adaptive FIFO) ....................................................... 32-9

32.4.4

Mapping TDM Time Slots to VCs............................................................................. 32-9

32.4.5

Trunk Condition....................................................................................................... 32-10

32.4.6

Channel Associated Signaling (CAS) Support ........................................................ 32-10

32.4.7

Mapping VC Signaling to CAS Blocks ................................................................... 32-11

32.4.7.1

CAS Routing Table.............................................................................................. 32-12

32.4.7.2

TDM-to-ATM CAS Support................................................................................ 32-13

32.4.7.2.1

CAS Mapping Using the Core (Optional) ....................................................... 32-14

32.4.7.3

ATM-to-TDM CAS Support................................................................................ 32-14

32.4.7.3.1

CAS Updates Using the Core (Optional) ........................................................ 32-15

32.5

ATM-to-TDM Adaptive Slip Control .......................................................................... 32-15

32.5.1

CES Adaptive Threshold Tables.............................................................................. 32-16

32.6

3-Step-SN Algorithm ................................................................................................... 32-20

32.6.1

The Three States of the Algorithm .......................................................................... 32-20

32.7

Pointer Verification Mechanism .................................................................................. 32-21

32.8

AAL-1 Memory Structure............................................................................................ 32-22

32.8.1

AAL1 CES Parameter RAM.................................................................................... 32-22

32.9

Receive and Transmit Connection Tables (RCT, TCT) ............................................... 32-25

32.9.1

Receive Connection Table (RCT)............................................................................ 32-26

32.9.1.1

AAL1 CES Protocol-Specific RCT ..................................................................... 32-29

32.9.2

Transmit Connection Table (TCT)........................................................................... 32-32

32.9.2.1

AAL1 CES Protocol-Specific TCT ..................................................................... 32-34

32.10

Outgoing CAS Status Register (OCASSR) ................................................................ 32-36

32.11

Buffer Descriptors........................................................................................................ 32-36

32.11.1

Transmit Buffer Operation....................................................................................... 32-36

32.11.2

Receive Buffer Operation ........................................................................................ 32-37

32.12

ATM Controller Buffers............................................................................................... 32-38

32.12.1

AAL1 CES RxBD.................................................................................................... 32-39

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