PM5361-RI PMC-Sierra, Inc., PM5361-RI Datasheet - Page 30

• Manufacturer Part Number: PM5361-RI
• Description: SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR
• Manufacturer: PMC-Sierra, Inc.

DATA SHEET
PMC-920526
9
9.1
9.2
FUNCTIONAL DESCRIPTION
Input Bus Demultiplexer
The input bus demultiplexer captures data sampled on the DIN bus and
distributes this data to the three tributary payload processors within the TUPP .
The input bus demultiplexer also provides timing signals for the other blocks
within the TUPP . The system clock, SCLK, is buffered and distributed to the
tributary payload processors and the output bus multiplexer. Frame alignment
signals for the incoming data stream, IC1J1, ITMF, and ISPE, are sampled,
buffered and distributed to the tributary payload processors (TPPs). In order to
have synchronous operation of the TPPs with a single clock, the incoming data
and control signals may be delayed by up to two system clock cycles before
distribution to the TPP . The delay is used to align the incoming data with the
outgoing data at each TPP . The amount of delay is adjusted such that the
separation of the incoming STS/AU frame and the outgoing frame at each TPP
appears to be in multiples of three SCLK periods.
When configured for AU4 mode, the input bus demultiplexer provides the
necessary timing coordination between the three tributary payload processors.
The single J1 byte marker input on IC1J1 is retimed and distributed to each of
the three tributary payload processors. The tributary multiframe detected by
TPP #1 is distributed to the two other TPPs, as TPP #1 is the only one receiving
a valid H4 byte.
Output Bus Multiplexer
The output bus multiplexer gathers data from the three tributary payload
processors within the TUPP and multiplexes this data onto the DOUT[7:0] bus. It
also multiplexes signals from each tributary payload processor that mark tributary
SPEs and tributary V5 bytes onto the shared OTSPE and OTV5 signals.
The output bus multiplexer also provides timing signals for other blocks within the
TUPP . Frame alignment signals for the outgoing data stream, OC1J1, OSPE and
OTMF, are sampled, buffered and distributed to the tributary payload processors
(TPPs). The output bus multiplexer contains a four frame counter that will
flywheel in the absence of an active OTMF input, internally generating tributary
multiframe timing for the outgoing data stream. When configured for locked
output mode, i.e. when OJ1EN is low, the output bus multiplexer will internally
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
ISSUE 8
TRIBUTARY UNIT PAYLOAD PROCESSOR
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PM5361 TUPP