PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
Pin Name Type
Pin No.
Function
PQFP PLCC
75 6
BTFP
Input
Backplane Transmit Frame Pulse
(BTFP). This input is used to frame
align the transmitter to the system
backplane. If basic frame alignment
only is required, a pulse at least 1
BTCLK cycle wide must be provided
on BTFP at multiples of 256 bit
periods. If multiframe alignment is
required, transmit multiframe
alignment must be enabled, and
BTFP must be brought high to mark
bit 1 of frame 1 of every 16 frame
signalling multiframe and brought low
following bit 1 of frame 1 of every 16
frame CRC multiframe. This mode
allows both multiframe alignments to
be independently controlled using the
single BTFP signal. Note that if the
signalling and CRC multiframe
alignments are coincident, BTFP must
pulse high for 1 BTCLK cycle every 16
frames.
BTCLK
Input
74
5
Backplane Transmit Clock (BTCLK).
This clock should be 2.048MHz with
optional gapping for adaptation from
non-uniform backplane data streams.
The E1XC may be configured to
ignore the BTCLK input and use the
RCLKO signal in its place.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
28
PMC [ PMC-SIERRA, INC ]
