XRT72L56 Datasheet, PDF (115/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
PRELIMINARY
XRT72L56
REV. P1.1.2
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 condi-
tion, please see Section 4.3.2.2.
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. Converse-
ly, if this bit-field is set to "1", then the Receive Sec-
tion is operating in the Loss of Frame state.
NOTE: For more information on the "Loss of Frame" State,
please see Section 4.3.2.2.
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,
please see Section 4.3.2.2.
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. Converse-
ly, if this bit-field is set to "1", then the Receive Sec-
tion is declaring the Loss of Signal condition.
NOTE: For more information on the Loss of Signal Condi-
tion, please see Section 4.3.2.7.
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 declar-
ing an AIS condition.
NOTE: For more information on the AIS Condition, please
see Section 4.3.2.8.
Bit 0 - RxFERF (Received Far-End-Receive-Fail-
ure) 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 de-
claring an FERF condition.
NOTE: For more information on the FERF Condition, please
see Section 4.3.2.9.
2.4.4.3 Receive E3 Framer Interrupt Enable
Register - 1 (E3, ITU-T G.751)
RXE3 INTERRUPT ENABLE REGISTER - 1 (ADDRESS = 0X12)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Not Used
COFA
Interrupt
Enable
OOF
Interrupt
Enable
LOF
Interrupt
Enable
LOS
Interrupt
Enable
AIS
Interrupt
Enable
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Bit 4 - COFA (Change of Frame Alignment) Inter-
rupt Enable
This Read/Write bit-field allows the user to enable or
disable the Change of Frame Alignment interrupt.
Setting this bit-field to "1" enables this interrupt. Set-
ting this bit-field to "0" disables this interrupt.
Bit 3 - OOF (Change in OOF Condition) Interrupt
Enable
This Read/Write bit field allows the user to enable or
disable the Change in Out-of-Frame (OOF) status in-
terrupt. Setting this bit-field to "1" enables this inter-
rupt. Setting this bit-field to "0" disables this interrupt.
NOTE: For more information on the OOF Condition, please
see Section 4.3.2.2.
Bit 2 - LOF (Change in LOF Condition) Interrupt
Enable
This Read/Write bit-field allows the user to enable or
disable the Change in Loss-of-Frame (LOF) status in-
terrupt. Setting this bit-field to "1" enables this inter-
rupt. Setting this bit-field to "0" disables this interrupt.
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