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PM73121 Datasheet(PDF) 68 Page - PMC-Sierra, Inc

Part # PM73121
Description  AAL1 Segmentation And Reassembly Processor
PDF  223 Pages
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Manufacturer  PMC [PMC-Sierra, Inc]
Direct Link  http://www.pmc-sierra.com
Logo PMC - PMC-Sierra, Inc

PM73121 Datasheet(HTML) 68 Page - PMC-Sierra, Inc

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PM73121 AAL1gator II
PMC-Sierra, Inc.
PMC-980620
,VVXH
AAL1 SAR Processor
Data Sheet
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cells. Anytime the SN state machine transitions from the SYNC state to the OUT_OF_
SEQUENCE state, the R_SEQUENCE_ERR counter (refer to “R_SEQUENCE_ERR Word For-
mat” on page 157) is incremented. Anytime a misinserted cell is detected the R_MISINSERTED
counter (refer to “R_SEQUENCE_ERR Word Format” on page 157) is incremented.
All cells received while in the SYNC state are accepted whether or not they are good. Any errored
cells received while in the SYNC state are marked as potentially bad cells. These marked cells
will not have their pointers checked, if they contain one; or if they contain signaling data, the sig-
naling data will not be written to memory.
Figure 32.
Fast SN Algorithm
OUT OF
SEQUENCE
in seq/accept
out of
seq/discard,
force underrun
out of
seq/discard,
force underrun
valid SN/discard (unless
NODROP_IN_START is set)
invalid
SN/discard
invalid
SN/discard,
force
underrun
invalid
SN/discard,
force
underrun
INVALID
OUT OF
SYNC
START
out of seq/accept
in seq-1+1/accept
in seq/insert cells/accept
in seq-1/discard
SYNC
invalid SN/discard
out of
seq/discard
in seq-1+1/accept
in seq-1/discard
invalid SN/accept
in seq/accept



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