PM5316 Datasheet, PDF (322/491 Pages) PMC-Sierra, Inc – Quad Channel 155 Mbit/s SONET/SDH Framer and Aligner

SONET/SDH Payload Extractor/Aligner (SPECTRA-4x155)
Production
Registers 1170H, 1270H, 1370H, 1470H, 1570H, 1670H, 1770H, 1870H, 1970H, 1A70H,
1B70H, 1C70H: DPGM Generator Control #1
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
GEN_A1A2_EN
GEN_INV_PRBS
GEN_AUTO
GEN_FERR
GEN_SIGE
GEN_FSENB
GEN_REGEN
GEN_EN
Default
0
0
0
0
0
0
0
0
GEN_EN
The Generator Enable (GEN_EN) bit enables the insertion of a pseudo random bit sequence
(PRBS) into the Drop Bus payload. When GEN_EN is set high, the PRBS bytes will
overwrite the processed payload data. When GEN_EN is set low, the incoming payload is
unaltered. This bit has not effect in Autonomous Input Mode.
GEN_REGEN
The Generator Regenerate (GEN_REGEN) bit can be used to re-initialize the generator LFSR
and begin regenerating the pseudo random bit sequence (PRBS) from the known reset state.
The LFSR reset state is dependent on the set sequence number. Setting this bit in a master
generator will automatically force all slaves to reset at the same time. This bit will clear itself
when the operation is complete. Upon a frame realignment on the Drop bus, the Generators
must be regenerated.
GEN_FSENB
The Generator Fixed Stuff Enable (GEN_FSENB) bit determines whether the pseudo random
bit sequence (PRBS) is inserted into the (STS-1/STM-0) fixed stuff bytes of the processed
payload. When set to logic one, the PRBS is not inserted into the fixed stuff bytes and the
bytes are output unaltered. When set to logic zero, the PRBS is inserted into the fixed stuff
bytes. The fixed stuff columns are columns 30 and 59 of the STS-1 payload.
GEN_FSEN should be disabled when using the generator in master/slave configuration to
support de-multiplexed concatenated payloads.
Proprietary and Confidential to PMC-Sierra, Inc. and for its customers’ internal use
303
Document ID: PMC-1990822, Issue 4