PM5361-RI PMC-Sierra, Inc., PM5361-RI Datasheet - Page 82
PM5361-RI
Manufacturer Part Number
PM5361-RI
Description
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5361-RI.pdf
(108 pages)
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DATA SHEET
PMC-920526
13
(ITMFH4=1)
DIN[7:0]
SCLK
IC1J1
ISPE
FUNCTIONAL TIMING
The timing of the TUPP input signals is illustrated in Figure 9. This diagram
shows a simple STS-3 case that outlines the function of the various input signals.
Data on DIN[7:0] is sampled on the rising edge of SCLK. The bytes forming the
three STS-1 synchronous payload envelopes are identified by the ISPE signal
being set high. The IC1J1 signal pulses high while ISPE is low to mark the
position of the first C1 byte in the STS-3 transport envelope. The IC1J1 signal is
set high for three SCLK periods while ISPE is also set high to mark the J1 bytes
of each STS-1 SPE. The ITMF signal is selectable to mark the V1 byte of the
first tributary in an STS-1 SPE or the H4 byte in the last (fourth) frame of a
tributary multiframe. In this diagram, ITMF is shown to be marking the last H4
byte of the tributary multiframe in STS-1 #1 and STS-1 #3. The H4 byte in STS-1
#2, as shown, is not last in the tributary multiframe. In this simple example, all
STS-1 SPEs are aligned to the STS-3 transport envelope such that the J1 bytes
directly follow the C1 bytes and no STS-1 pointer justification events are
occurring.
This same diagram applies for the AU3 mode as it is equivalent to the STS-1
mode, except for nomenclature.
Figure 9
ITMF
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
STS-1 #1 SPE J1 byte
A1
STS-1 #2 SPE J1 byte
A1 A1 A2 A2 A2 C1 C1 C1
STS-1 #3 SPE J1 byte
- Input Bus Timing - Simple STS-1/AU3 Case
ISSUE 8
J1 J1 J1
No stuffing
occuring
••••
H2 H3 H3 H3
TRIBUTARY UNIT PAYLOAD PROCESSOR
H4 H4 H4
74
PM5361 TUPP
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