PM6344 datasheet(202/256 Pages) PMC

202 / 256 page

STANDARD PRODUCT

PMC-Sierra, Inc.

PM6344 EQUAD

PMC-951013

ISSUE 5

QUADRUPLE E1 FRAMER

189

The Transmit Backplane is configured to expect bit interleaved 16.384MHz data.

PCM and signaling for all four receivers are presented on a single pin, MTD. The

superscripts represent the index of the particular E1 stream. The Transmit

Backplane Options register for each receiver is programmed with BRX2RAIL=0.

For input frame pulses shown in the preceding figure, BTXMFP=0. The MENB

input is low.

Note that in normal operation, where the TRAN block inserts all the TS0

overhead, the PCM inputs on MTD are "don't cares" for TS0 and TS16. The

preceding diagram shows the TS0 bits for timing reference purposes only.

If the backplane transmit parity is enabled, the International bit (Si bit) position of

the PCM data stream in each frame should contain the PCM parity bit. The

parity bit of each SIG stream follows the parity bit of the PCM data stream.

In the case where MENB=0 and BTXMFP=1, the input MTFP marks the start of

the signaling multiframe and the start of the CRC multiframe as described in the

description of the Transmit Backplane Options register. The waveforms for this

case are shown in Fig. 21.

PM6344 Datasheet(PDF) 202 Page - PMC-Sierra, Inc