XRT79L71 Datasheet, PDF (165/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

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PRELIMINARY
1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L71
REV. P1.0.3
BIT NUMBER
3
RxAIS
NAME
2
RxPLD Unstab
1
RxTMark
0
RxFERF
TYPE
R/O
R/O
R/O
R/O
DESCRIPTION
Receive AIS Indicator:
This READ-ONLY bit-field indicates whether or not the Frame
Synchronizer block is currently detecting an AIS pattern, in the
incoming E3 data stream; as indicated below.
0 - The Frame Synchronizer block is NOT currently detecting an
AIS pattern in the incoming E3 data stream.
1 - The Frame Synchronizer block is currently detecting an AIS
pattern in the incoming E3 data stream.
NOTE: The Frame Synchronizer block will declare an "AIS"
condition if it detects 7 or less "0s" within two
consecutive "incoming" E3 frames.
Receive Payload-Type Unstable Indicator:
This READ-ONLY bit-field indicates whether or not the Payload
Type (within the MA bytes of each incoming E3 frame) has been
consistent in the last 5 frames, as indicated below.
0 - The Payload Type value has been consistent for at least 5
consecutive E3 frames.
1 - The Payload Type value has NOT been consistence for the
last 5 E3 frames.
Received (Validated) Timing Marker:
This READ-ONLY bit-field indicates the value of the most
recently validated "Timing Marker".
Receive FERF (Far-End-Receive Failure) Indicator:
This READ-ONLY bit-field indicates whether or not the Frame
Synchronizer is currently declaring a FERF condition, as indi-
cated below.
0 - The Frame Synchronizer block is NOT currently declaring a
FERF condition.
1 - The Frame Synchronizer block is currently declaring a FERF
condition.
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