PM6341 datasheet(41/272 Pages) PMC

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PM6341 E1XC

DATA SHEET

PMC-910419

ISSUE 8

E1 FRAMER/TRANSCEIVER

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

Pin No.

Pin Name

Type

PQFP

PLCC

Function

BRFPO

Output

When configured for backplane

receive composite multiframe output,

BRFPO goes high on the falling

BRCLK edge (or RCLKO edge if

ELST is by-passed) marking the

beginning of bit 1 of frame 1 of every

16 frame signalling multiframe,

indicating the signalling multiframe

alignment of the BRPCM data stream,

and returns low on the falling BRCLK

edge (or RCLKO edge if ELST is by-

passed) marking the end of bit 1 of

frame 1 of every 16 frame CRC

multiframe, indicating the CRC

multiframe alignment of the BRPCM

data stream. This mode allows both

multiframe alignments to be decoded

externally from the single BRFPO

signal. If the signalling and CRC

multiframe alignments are coincident,

BRFPO will pulse high for 1 clock

cycle.

When configured for backplane

receive overhead output, BRFPO is

high for timeslot 0 and timeslot 16 of

each 256-bit frame, indicating the

overhead bit positions of the BRPCM

data stream.

BRFPO is updated on the falling edge

of BRCLK or RCLKO.

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