PM5351 datasheet(97/393 Pages) PMC

97 / 393 page

S/UNI-TETRA

PMC-Sierra, Inc.

PM5351 S/UNI-TETRA

DATASHEET

PMC-1971240

ISSUE 7

SATURN USER NETWORK INTERFACE (155-TETRA)

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

from path BIP-8 errors detected by the receive path overhead processor, RPOP.

Far end block errors may be inserted under register control for diagnostic

purposes.

10.12 Transmit ATM Cell Processor (TXCP)

The Transmit ATM Cell Processor (TXCP) provides rate adaptation via

idle/unassigned cell insertion, provides HCS generation and insertion, and

performs ATM cell scrambling. The TXCP contains a four cell transmit FIFO. An

idle or unassigned cell is transmitted if a complete ATM cell has not been written

into the FIFO.

10.12.1

Idle/Unassigned Cell Generator

The Idle/Unassigned Cell Generator inserts idle or unassigned cells into the cell

stream when enabled. Registers are provided to program the GFC, PTI, and

CLP fields of the idle cell header and the idle cell payload. The idle cell HCS is

automatically calculated and inserted.

10.12.2

Scrambler

The Scrambler scrambles the 48 octet information field. Scrambling is performed

using a parallel implementation of the self synchronous scrambler (x43 + 1

polynomial) described in the references. The cell headers are transmitted

unscrambled, and the scrambler may optionally be disabled.

10.12.3

HCS Generator

The HCS Generator performs a CRC-8 calculation over the first four header

octets. A parallel implementation of the polynomial, x8+x2+x+1, is used. The

coset polynomial, x6+x4+x2+1, is added (modulo 2) to the residue. The HCS

Generator optionally inserts the result into the fifth octet of the header.

10.13 Transmit POS Frame Processor (TXFP)

The Transmit POS Frame Processor (TXFP) provides rate adaptation by

transmitting flag sequences (0x7E) between packets, provides FCS generation

and insertion, performs packet data scrambling, and provides performance

monitoring functions. The TXFP contains a 256 byte transmit FIFO. This FIFO is

used to separate the STS-3c (STM-1) line timing from the link layer system

timing, and to handle timing differences caused by insertion of escape

characters.

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