MPC8280 datasheet(1149/1386 Pages) FREESCALE

1149 / 1386 page

Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

34-3

— Stuffing—insertion of ‘stuff’ cells into fast links—in order to maintain an average data rate

between links of a group

— Discards cells with bad HECs (available on .25

µm rev B silicon and forward)

•

Delay synchronization--correlating IMA frames among links of a group

•

Maximum differential delay supported is user-programmable

•

Optionally recovers IMA data clock rate (IDCR)

•

Provides interrupts on errors/state changes

•

Maintains low-level statistic counters

— Transmit stuff events

— Receive stuff events

— Receive ICP violations

— Receive Out-of-IMA Frame anomalies

34.1.1

References

The features provided by the IMA microcode are driven by The ATM Forum’s IMA specification. The

implementation of the IMA microcode is driven by the features, architecture, and resources available on

the MPC8280. In addition to published MPC8280 device errata, users should be familiar with the

following (available at www.atmforum.com):

•

The ATM Forum Technical Committee. Inverse Multiplexing for ATM (IMA) Specification

Version 1.1 - AF-PHY-0086.001

•

The ATM Forum Technical Committee. Inverse Multiplexing for ATM (IMA) Specification

Version 1.0 - AF-PHY-0086.000

34.1.2

IMA Versions Supported

The IMA microcode supports IMA version 1.0 and version 1.1, with only minor configuration changes.

These include the following:

•

Programming the IMA version encoding in the OAM labels of the transmit ICP and Filler cell

templates.

•

Programming the validated OAM label field in the IMA group receive parameters.

34.1.3

MPC8280 Versions Supported

IMA support in ROM is available on the MPC8264 and the MPC8266. On these derivatives of the

MPC8280 family, integrated DS1/E1 transmission convergence (TC) layer hardware facilitates HEC

checking of received cells. (Refer to Chapter 35, “ATM Transmission Convergence Layer.”) So in these

MPC8280 devices, IMA support is available for either the integrated DS1/E1 TC layer or external

UTOPIA PHY devices connected via UTOPIA Level 2 multi-PHY.

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