MPC8280 datasheet(1202/1386 Pages) FREESCALE

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Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

34-56

Freescale Semiconductor

34.5.3.6

Transmit Group State Machine Control

•

Define the IMA group(s)

— Assign IMA ID

— Assign Link IDs and the transmit group order table

— Assign TRL

— Assign IMA frame size (M)

— Signal group parameters via ICP cells

— Define ATM pace controller (APC) parameters for this transmit group

•

Signal transmit group state via ICP cells

•

Negotiate transmit group parameters with the far end

•

Check status of links in group to make ‘Sufficient Links’ determination

•

Control group operation (via IGTCNTL[TXSC]) in coordination with group state

•

Coordinate link state transitions with group state transitions during group startup and link addition

34.5.3.7

Group Symmetry Control

All types of group symmetry (operation and configuration) are supportable. This is facilitated by the ability

to independently enable/disable links (via RXPHYEN and TXPHYEN) and to control link and group

states (via independent link and group transmit and receive parameters).

34.5.3.8

ICP End-to-End Channel Transmission

•

Can send information on end-to-end channel by updating field in Tx ICP.

•

No Rx support is provided for end-to-end channel.

34.5.3.9

Link Addition and Slow Recovery (LASR) Procedure

Coordinate addition of links for both receive and transmit, including the following:

•

Establishing their parameters

•

Checking for defects

•

On-the-fly insertion into data structures

34.5.3.10 Failure Alarms

•

React to errors signalled in received ICP cells

•

React to physical layer errors

•

Monitor persistence of errors to determine alarm condition.

•

Report receive defects within 2M cells of entering defect state

•

Signal upper-layer software

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