PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
ROHM
BRXSMFP BRXCMFP Result
0
1
1
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. Note that if
the signalling and CRC multiframe
alignments are coincident, BRFPO
will pulse high for 1 BRCLK cycle
(or RCLKO cycle if ELST is by-
passed) every 16 frames.
1
X
X
Backplane receive overhead
output:
BRFPO is high for timeslot 0 and
timeslot 16 of each 256-bit frame,
indicating the overhead of the
BRPCM data stream.
Upon reset of the E1XC, these bits are cleared to zero.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
71
PMC [ PMC-SIERRA, INC ]
