XRT72L71 Datasheet, PDF (57/102 Pages) Exar Corporation – DS3 ATM UNI/CLEAR CHANNEL FRAMER

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XRT72L71
DS3 ATM UNI/CLEAR CHANNEL FRAMER
REV. 1.1.0
REGISTER 14
BIT
FUNCTION
7 Rx AIS
6 Rx LOS
5 Rx Idle
4 Rx OOF
3 Internal LOS Disable
2 Framing On Parity
1 Fsync Algo
0 Msync Algo
TABLE 15: RX DS3 CONFIGURATION AND STATUS REGISTER
RX DS3 CONFIGURATION AND STATUS REGISTER
HEX ADDRESS: 0X0E
TYPE
RO
RO
DEFAULT
DESCRIPTION-OPERATION
Receive AIS Alarm Indicator:
0: Indicates that the Receive DS3 Framer block is NOT detecting the “AIS”
0
(Alarm Indication Signal) pattern, within the inbound DS3 data stream.
1: Indicates that the Receive DS3 Framer block is currently detecting the
“AIS” pattern within the “inbound” DS3 data stream.
Receive LOS Alarm Indicator:
0: Indicates that the Receive DS3 Framer block is NOT currently declaring
0
an LOS (Loss of Signal) condition.
1: Indicates that the Receive DS3 Framer block is currently declaring an
LOS (Loss of Signal) condition.
Receive Idle Pattern Indicator:
0: Indicates that the Receive DS3 Framer block is NOT currently detecting
RO
0
the “Idle” pattern, within the inbound DS3 data stream.
1: Indicates that the Receive DS3 Framer block is currently detecting the
“Idle” pattern within the inbound DS3 data stream.
Receive OOF (Out of Frame) Alarm Indicator:
0: Indicates that the Receive DS3 Framer block is NOT currently declaring
RO
1
the “OOF (Out of Frame) condition.
1: Indicates that the Receive DS3 Framer block is currently declaring the
“OOF” (Out of Frame) condition.
0: On chip LOS detector is disabled. The XRT72L71 will only declare LOS
(Loss of Signal) is the “RLOS” input pin is pulled “high”.
R/W
0
1: On chip LOS detected is enabled. The XRT72L71 will declare and clear
LOS based upon the absence of a certain number of pulses in the incoming
DS3 data stream.
Framing On-Parity (In-Frame Declaration Criteria):
0: Receive DS3 Framer block declares the “Inframe” condition after “F-bit”
and “M-bit synchronization” have been achieved. P-bit checking is not a
R/W
0
part of “Frame Acquisition” process.
1: Receive DS3 Framer block declares the “Inframe” condition after “F-bit”
and “M-bit synchronization” process. Additionally, the Receive DS3 Framer
block must also detect valid (e.g., un-erred) P-bits.
0: OOF (Receive Out of Frame) condition is declared when 6 out of 16 con-
R/W
0
secutive F bits are in error
1: OOF (Receive Out of Frame) condition is declared when 3 out of 16 con-
secutive F bits are in error
R/W
0
0: M-bit errors do not result in declaration of OOF
1: OOF is declared when M-bits in 3 out of 4 frames are in error.
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