XRT7234
E3 UNI FOR ATM
x r
PRELIMINARY
REV. P1.0.0
60
Bit 3—RxAIS (Alarm Indication Status Declaration)
This “Read-Only” bit-field indicates whether or not the Receive E3 Framer is currently experiencing an “AIS” condition.
The Receive E3 Framer will declare an AIS condition if it has detected two consecutive E3 frames, that each contain less
than seven (7) “0s” . If this bit-field is set to “1”, then the Receive E3 Framer has declared, and is continuing to expe-
rience an AIS condition. If this bit-field is set to “0”, then the Receive E3 Framer is currently not experiencing an AIS
condition.
Bit 2—RxPLDType UnStab
This “Read-Only” bit-field indicates whether or not the Receive E3 Framer has been receiving a consistent “Payload
Type” value (within the MA Byte-Field); in the last 5 consecutive incoming E3 frames.
If the Receive E3 Framer has detected a change in the “Payload Type” value, within the last 5 incoming E3 frames, then
it will set this bit-field to “1”. If the “Payload Type” value has been consistent in the last 5 E3 frames, then the
Receive E3 Framer will set this bit-field to “0”.
Bit 1—Rx TMark
This “Read-Only” bit-field reflects the “most recently” validated “Timing Marker” value. The Receive E3 Framer will
validate the “Timing Marker” state, after it has detected a “user-selectable” number of consecutive incoming E3 frames
with a consistent “Timing Marker” value. The user makes this selection by writing the appropriate value to Bit 3 (RxT-
MarkAlgo) within the “Rx E3 Configuration/Status Register (Address = 0Eh).
Bit 0—RxFERF (Far End Receive Failure)
This “Read-Only” bit-field indicates whether or not the Receive E3 Framer is experiencing an “FERF” (Far-End-
Receive-Failure) condition. The Receive E3 Framer will declare a “FERF” condition, if it has received a “user-selectable”
number of consecutive E3 frames, with the FERF bit-field (within the MA byte) set to “1”. This “user-selectable” number is
either 3 or 5 E3 frames. Conversely, the Receive E3 Framer will “negate” the FERF declaration, if it has received this
“user-selectable” number of consecutive E3 frames, with the FERF bit-field set to “0”.
If this bit-field is set to “1”, then the Receive E3 Framer has declared an FERF condition. If this bit-field is set to “0”,
then the Receive E3 Framer has not declared an FERF condition.
Please see Sections 6.3.3.3.1 and 7.1.2.3.3, for a more detailed discussion on the meaning of the FERF bit-field,
within the E3 frame.
3.3.2.18 Rx E3 Interrupt Enable Register-1
Bit 4—Change of Frame Alignment Interrupt 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. Setting this bit-field to “0” disables this interrupt.
Bit 3—OOF (Out of Frame) Interrupt Enable
This “Read/Write” bit field allows the user to enable or disable the “Change in Out-of-Frame (OOF) status” interrupt.
Address = 10h, Rx E3 Interrupt Enable Register-1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Unused
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