PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
start of the CRC multiframe alignment). This diagram does not apply if the digital
receive interface is configured for unipolar operation (i.e. RUNI=1 and RDIEN=1).
Figure 21
-Transmit Backplane Interface
BTCLK
BTFP
BTPCM
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
Don't Care
Don't Care
A B C D
A B C D
A B C D
Don't Care
BTSIG
Timeslot 31
Timeslot 0
Timeslot 1
Timeslot 16
Timeslot 17
The Transmit Backplane is configured to receive 2048 kbit/s, single-rail formatted
data with frame alignment indication.The Transmit Backplane Options register is
programmed to BTXCLK=0, BTX2RAIL=0, BTXMFP=0. (If BTXMFP=1, the
BTFP input 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.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
195
PMC [ PMC-SIERRA, INC ]
