MPC8280 datasheet(1148/1386 Pages) FREESCALE

1148 / 1386 page

Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

34-2

Freescale Semiconductor

The MPC8280’s IMA microcode alone does not implement all of these functions. Software running on the

MPC8280 is responsible for managing the start-up procedure, handling changes in group control, status,

and maintaining the Link State Machine and Group State Machine. In general, the MPC8280 IMA

microcode implements most of the IMA sublayer user plane functions and provides interrupts/statistics for

the layer and plane management functions.

The key features of the IMA microcode are:

•

Supports any FCC with multi-PHY UTOPIA capability

•

Supports both IMA links and non-IMA links on the same FCC (on a per-PHY basis)

•

Supports up to 8 IMA groups with one FCC

•

Supports up to 8 links per IMA group using an internal TC layer hardware

•

Supports up to 31 links per IMA group using an external TC layer device. Note that a maximum

of 31 total links can be supported either on FCC1 or FCC2 but not concurrently on both FCCs)

•

Performs the following IMA User Plane functions

— ATM cell stream splitting and reconstruction

— ICP cell insertion/removal--communication of control and framing information

— Cell rate decoupling--insertion of ‘filler’ cells when ATM layer cells are unavailable

— IMA frame synchronization--finding IMA frame boundaries within links

Table 34-1. IMA Sublayer in Layer Reference Model

Layer

Sublayer

User Plane

Functions

Layer Management

Functions

Plane Management

Functions

ATM

—

——

—

Physical

IMA Specific

Transmission

Convergence

• ATM cell stream splitting

and reconstruction

• ICP Cell Insertion &

Removal

• Cell Rate decoupling

• IMA frame synch

• Stuffing

• Discarding bad-HEC cells

• IMA connectivity

• ICP cell errors (OIF)

• LIF/LODS/RDI-IMA defect

processing

• RDI-IMA alarm generation

• Tx/Rx IMA link state report

• IMA group configuration

• Link addition/removal

• ATM cell rate change

• IMA group failure

notification

• IMA statistics

Interface

Specific

Transmission

Convergence

• No cell discarding

• No cell rate decoupling

——

• Cell delineation

• Cell scrambling &

descrambling

• Header error correction

• HEC generation &

verification

• HEC error indication

• LCD-RDI alarm

Generation

• LCD failure notification

• TC statistics

Physical

Medium

Dependent

• Bit timing

• Line coding

• Physical Medium

• Local alarm processing

• RDI alarm generation

• Link failure notification

•PMD state

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