
x r
PRELIMINAZRY
E3 UNI FOR ATM
XRT7234
REV. P1.0.0
59
Writing a “0” into this bit-field causes the Receive E3 Framer to “validate” the Timing Marker value after receiving 3
consecutive incoming E3 frames, with the “Timing Marker” bit-field of a given value. Writing a “1” into this bit-field
causes the Receive E3 Framer to validate the “Timing Marker” value after receiving 5 consecutive incoming E3
frames, with the “Timing Marker” bit-field of a given value.
Bits 2–0: RxPLDExp[2:0]
This “Read/Write” bit-field allows the user to specify the “Payload Type” that he/she expects in the MA bytes, of each
incoming E3 frame.
If the Receive E3 Framer detects a “Payload Type” that differs from the values within these bit-fields, then the UNI will
generate the “Payload Type Mismatch” interrupt.
3.3.2.17 Rx E3 Status and Configuration Register-2
Bit 7—RxLOF Algo (Loss of Frame Declaration Algorithm)
This “Read/Write” bit-field allows the user to select the “LOF” (Loss of Frame) Declaration criteria, that will be used
by the Receive E3 Framer. Writing a “0” to this bit-field configures the Receive E3 Framer to declare an LOF condi-
tion, after it has been in the OOF condition for 24 frame periods (3 ms). Writing a “1” to this bit-field configures the
Receive E3 Framer to declare an LOF condition, after it has been in the OOF condition for 8 frame periods (1 ms).
Bit 6—RxLOF (Loss of Frame Declaration)
This “Read-Only” bit-field indicates whether or not the Receive E3 Framer is currently in the “Loss of Frame” (LOF)
condition. If this bit-field is set to “1”, then the Receive E3 Framer is currently in the LOF condition. Conversely, if
this bit-field is set to “0”, then the Receive E3 Framer is currently not in the LOF condition.
Bit 5—RxOOF (Out of Frame Declaration)
This “Read-Only” bit field indicates whether or not the Receive E3 Framer is currently experiencing an “Out of
Frame” (OOF) condition. The Receive E3 Framer will declare an OOF condition if it has detected errors in the frame
alignment bytes (FA1 and FA2) in four consecutive frames. If this bit-field is set to “1”, then the Receive E3 Framer
has declared, and is continuing to experience an OOF condition. If this bit-field is set to “0”, then the Receive E3
Framer is currently not experiencing an OOF condition.
Bit 4—RxLOS (Loss of Signal Declaration)
This “Read-Only” bit-field indicates whether or not the Receive E3 Framer is currently experiencing a “Loss of Signal”
(LOS) condition. The Receive E3 Framer will declare an LOS condition if it has detected a string of 32 consecutive
“0s”, via the RxPOS and RxNEG input pins. If this bit-field is set to “1”, then the Receive E3 Framer has declared,
and is continuing to experience an LOS condition. If this bit-field is set to “0”, then the Receive E3 Framer is currently
not experiencing an LOS condition.
Address = 0Fh, Rx E3 Configuration and Status Register-2
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RxLOF Algo
RxLOF
RxOOF
RxLOS
RxAIS
RxPLD Type
UnStab
Rx TMark
RxFERF
RW
RO
RO
RO
RO
RO
RO
RO
0
1
1
0
0
1
1
1