PM73121ꢀAAL1gator II
Data Sheet
PMC-Sierra, Inc.
PMC-980620
,VVXHꢀꢁ
AAL1 SAR Processor
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.
invalid SN/discard
START
valid SN/discard (unless
NODROP_IN_START is set)
invalid
SN/discard
invalid
SN/discard,
force
invalid
SN/discard,
force
out of
seq/discard
underrun
underrun
OUT OF
SYNC
out of
seq/discard,
force underrun
out of
seq/discard,
force underrun
in seq/accept
out of seq/accept
in seq-1+1/accept
invalid SN/accept
OUT OF
SEQUENCE
in seq-1/discard
in seq-1+1/accept
in seq/insert cells/accept
in seq-1/discard
SYNC
INVALID
in seq/accept
Figure 32. Fast SN Algorithm
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.
ꢄꢀ
PMC [ PMC-SIERRA, INC ]
