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XRT7250 Datasheet, PDF (98/463 Pages) Exar Corporation – DS3/E3 FRAMER IC
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DS3/E3 FRAMER IC
XRT7250
REV. 1.1.1
RXE3 CONFIGURATION & STATUS REGISTER - 2 (ADDRESS = 0X11)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
RxLOF
Algo
RxLOF
RxOOF
RxLOS
RxAIS
Not Used
R/W
RO
RO
RO
RO
RO
RO
0
1
1
0
0
1
1
BIT 0
RxFERF
RO
1
Bit 7 - RxLOF (Receive Loss of Frame) Al-
go(rithm) Select
This Read/Write bit-field permits the user to select
the Receive Loss of Frame Declaration Algorithm, for
the Receive Section of the XRT7250.
Setting this bit-field to "0" configures the Receive
Section to declare a Loss of Frame condition, if it re-
sides 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 re-
sides 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 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 Framer IC 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 Framer IC is currently declar-
ing 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 Framer IC is currently declar-
ing 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 Framer IC is currently declar-
ing 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.
2.3.4.3 Receive E3 Framer Interrupt Enable
Register - 1 (E3, ITU-T G.751)
79