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STANDARD PRODUCT
PMC-Sierra, Inc.
PM6344 EQUAD
PMC-951013
ISSUE 5
QUADRUPLE E1 FRAMER
182
logic 0, the specific bit value is sourced from the TRAN block
International/National Control register. Depending on the settings of the
TXSAxEN bits, the effective bit rate of the data link may range between 4 bit/s
and 20 kbit/s. TDLSIG[x] is sampled on the rising edge of TDLCLK[x]. Note that
the TDLSIG[x] data is shifted from the corresponding BTPCM[x] data by 2 bits.
12.1 Receive Backplane Interface
Figure 13
- ROHM=0, BRX2RAIL=0, BRXSMFP=0 and BRXCMFP=0
1 2 3 4 5 6 7 8
A B C D
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
A B C D
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
A B C D
Timeslot 31
Timeslot 0
Timeslot 1
Timeslot 16
Timeslot 17
BRCLK
BRFPO[x]
BRPCM[x]
BRSIG[x]
BRFPI
Undefined
Undefined
Undefined
The Receive Backplane is configured to generate 2048 kbit/s, single-rail
formatted data with frame alignment indication. The Receive Backplane Options
register is programmed to BRX2RAIL=0, BRXSMFP=0 and BRXCMFP=0.
The BRFPI input pulse need not exist every frame; only one is required to align
the backplane signals. If no BRFPI pulse has been presented since reset, the
outputs will assume an arbitrary alignment.
If ROHM=0, BRXSMFP=0 and BRXCMFP=1, the BRFPO[x] signal pulses high
only during the first bit of the first frame in the CRC multiframe.
If ROHM=0, BRXSMFP=1 and BRXCMFP=0, the BRFPO[x] signal pulses high
only during the first bit of the frame containing the signaling multiframe alignment
signal.