
STANDARD PRODUCT
PMC-Sierra, Inc.
PM6344 EQUAD
PMC-951013
ISSUE 5
QUADRUPLE E1 FRAMER
18
Pin Name
Type
Pin No.
Function
Backplane Frame Pulse Output (BRFPO[4:1]). When
the EQUAD is configured for backplane receive frame
pulse output, each BRFPO[x] pulses high for 1 BRCLK
cycle (or 1 RCLKO[x] cycle if ELST is by-passed or the
RCLKOSEL register bit is set) during bit 1 of each 256-
bit frame, indicating the frame alignment of the
BRPCM[x] data stream.
When configured for backplane receive signaling
multiframe output, BRFPO[x] pulses high for 1 BRCLK
cycle (or 1 RCLKO[x] cycle if ELST is by-passed) during
bit 1 of frame 1 of the 16 frame signaling multiframe,
indicating the signaling multiframe alignment of the
BRPCM[x] data stream. (Even when signaling
multiframing is disabled, the BRFPO[x] output continues
to indicate every 16th frame.)
When configured for backplane receive CRC multiframe
output, BRFPO[x] pulses high for 1 BRCLK cycle (or 1
RCLKO[x] cycle if ELST is by-passed) during bit 1 of
frame 1 of every 16 frame CRC multiframe, indicating
the CRC multiframe alignment of the BRPCM[x] data
stream. (Even when CRC multiframing is disabled, the
BRFPO[x] output continues to indicate the position of bit
1 of the FAS frame every 16th frame.)
When configured for backplane receive composite
multiframe output, BRFPO[x] goes high on the falling
BRCLK edge (or RCLKO[x] edge if ELST is by-passed)
marking the beginning of bit 1 of frame 1 of every 16
frame signaling multiframe, indicating the signaling
multiframe alignment of the BRPCM[x] data stream, and
returns low on the falling BRCLK edge (or RCLKO[x]
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[x] data
stream. In this mode both multiframe alignments can be
decoded externally from the single BRFPO[x] signal. If
the signaling and CRC multiframe alignments are
coincident, BRFPO[x] will pulse high for 1 clock cycle.
When configured for backplane receive overhead
output, BRFPO[x] is high for timeslot 0 and timeslot 16
of each 256-bit frame, indicating the overhead bit
positions of the BRPCM[x] data stream.
BRFPO[x] is updated on the falling edge of the BRCLK
or RCLKO[x].
BRFPO[1]
BRFPO[2]
BRFPO[3]
BRFPO[4]
Output
95
96
97
98