MPC8280 datasheet(1218/1386 Pages) FREESCALE

1218 / 1386 page

ATM Transmission Convergence Layer

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

35-2

Freescale Semiconductor

35.1

Features

Primary features of the TC layer include the following:

•

Eight TDM channels routed in hardware to eight TC layer blocks

— Protocol-specific overhead bits may be discarded or routed to other controllers by the SI

— Performing ATM TC layer functions (according to ITU-T I.432)

— Transmit (Tx) updates are as follows:

– Cell HEC generation

– Payload scrambling using self synchronizing scrambler (programmable by the user)

– Coset generation (programmable by the user)

– Cell rate by inserting idle cells

— Receive (Rx) updates are as follows:

– Cell delineation using bit by bit HEC checking and programmable ALPHA and DELTA

parameters for the delineation state machine

– Payload descrambling using self synchronizing scrambler (programmable by the user)

– Coset removing (programmable by the user)

– Filtering idle/unassigned cells (programmable by the user)

– Performing HEC error detection and single bit error correction (programmable by the user)

– Generating loss of cell delineation status/interrupt (LOC / LCD)

•

Operates with FCC2 (UTOPIA 8)

•

Serial loop back mode

•

Cell echo mode

•

Supports both FCC transmit modes:

— External rate mode—Idle cells are generated by the FCC (microcode) to control data rate

— Internal rate mode (sub-rate)—FCC transfers only the data cells using the required data rate.

The TC layer generates idle/unassigned cells to maintain the line bit rate

•

Supports the TC layer and PMD (physical medium dependent) WIRE interface (according to the

ATM-Forum af-phy-0063.000)

•

Cell counters for performance monitoring:

— 16-bit counters count:

– HEC errored cells

– HEC single bit errored and corrected cells

– Idle/unassigned cells filtered

– Idle/unassigned cells transmitted

– Transmitted ATM cells

– Received ATM cells

— Maskable interrupt sent to the host when a counter expires

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