XRT72L50 Datasheet, PDF (90/471 Pages) Exar Corporation – SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER WITH HDLC CONTROLLER
REV. 1.2.1
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Setting this bit-field to "0" configures the Receive Section to declare a Loss of Frame condition, if it resides in
the OOF (Out of Frame) Condition for 24 E3 Frame periods. Likewise, the Receive Section will clear the Loss
of Frame condition, if it resides in the In-Frame condition for 24 E3 Frame periods.
Setting this bit-field to "1" configures the Receive Section to declare a Loss of Frame condition, if it resides in
the OOF (Out of Frame) condition for 8 E3 Frame periods. Likewise, the Receive Section will clear the Loss of
Frame condition, if it resides in the In-Frame condition for 8 E3 Frame periods.
NOTE: For more information on the LOF and OOF condition, refer to Section 5.3.2.2.
Bit 6 - RxLOF (Receive Loss of Frame) Status
This Read-Only bit-field indicates whether or not the Receive Section of the Framer IC is operating in the Loss
of Frame state.
If this bit-field is set to "0", then the Receive Section is NOT operating in the Loss of Frame state. Conversely,
if this bit-field is set to "1", then the Receive Section is operating in the Loss of Frame state.
NOTE: For more information on the "Loss of Frame" State, refer to Section 5.3.2.2.
Bit 5 - RxOOF (Receive Out of Frame) Status
This Read-Only bit-field indicates whether or not the Receive Section of the Channel is operating in the Out of
Frame state.
If this bit-field is set to "0", then the Receive Section is NOT operating in the Out of Frame state. Conversely, if
this bit-field is set to "1", then the Receive Section is operating in the Out of Frame state.
NOTE: For more information on the Out of Frame State, refer to Section 5.3.2.2.
Bit 4 - RxLOS (Receive Loss of Signal) Status
This Read-Only bit-field indicates whether or not the Receive Section of the Channel is currently declaring an
LOS (Loss of Signal) Condition.
If this bit-field is set to "0", then the Receive Section is NOT declaring a Loss of Signal condition. Conversely, if
this bit-field is set to "1", then the Receive Section is declaring the Loss of Signal condition.
NOTE: For more information on the Loss of Signal Condition, refer to Section 5.3.2.7.
Bit 3 - RxAIS (Receive Alarm Indication Signal) Status
This Read-Only bit-field indicates whether or not the Receive Section of the Channel is currently declaring an
AIS (Alarm Indication Signal) Condition.
If this bit-field is set to "0", then the Receive Section is NOT declaring a AIS condition. Conversely, if this bit-
field is set to "1", then the Receive Section is declaring an AIS condition.
NOTE: For more information on the AIS Condition, refer to Section 5.3.2.8.
Bit 0 - RxFERF (Received Far-End-Receive-Failure) Status
This Read-Only bit-field indicates whether or not the Receive Section of the Channel is currently declaring a
FERF (Far-End Receive Failure) Condition.
If this bit-field is set to "0", then the Receive Section is NOT declaring a FERF condition. Conversely, if this bit-
field is set to "1", then the Receive Section is declaring an FERF condition.
NOTE: For more information on the FERF Condition, refer to Section 5.3.2.9.
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