PM4341AT1XC
DATA SHEET
PMC-900602
ISSUE 7
T1 FRAMER/TRANSCEIVER
Pin
Pin No.
Name
BRFPO
Type
PQFP PLCC Function
Output 47
49
Backplane Frame Pulse Output
(BRFPO). When the T1XC is configured
for backplane receive frame pulse output,
BRFPO pulses high for 1 BRCLK cycle
(or 1 RCLKO cycle if ELST is by-passed)
during bit 1 of each 193-bit frame,
indicating the frame alignment of the
BRPCM data stream.
When configured for backplane receive
superframe output, BRFPO pulses high
for 1 BRCLK cycle (or 1 RCLKO cycle if
ELST is by-passed) during bit 1 of frame
1 of the 12 or 24 frame superframe,
indicating the superframe alignment of
the BRPCM data stream.
When configured for backplane alternate
receive superframe output, BRFPO
pulses high for 1 BRCLK cycle (or 1
RCLKO cycle if ELST is by-passed)
during bit 1 of frame 1 of every second
12 or 24 frame superframe, indicating the
superframe alignment of the BRPCM
data stream. This alternate superframe
indication is useful for performing format
conversion from SF to ESF while
maintaining the same superframe
alignment.
BRFPO is updated on the falling edge of
BRCLK or RCLKO.
BRCLK
Input
32
37
Backplane Receive Clock (BRCLK). This
clock should be either 1.544MHz or
2.048MHz with optional gapping for
adaptation to non-uniform backplane
data streams. The T1XC may be
configured to ignore the BRCLK input
and use the RCLKO signal in its place
when the ELST is bypassed.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
23
PMC [ PMC-SIERRA, INC ]
