XRT72L13 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT72L13' PDF : 370 Pages View PDF
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PRELIMINARY
PIN DESCRIPTIONS
PIN #
NAME
197
RxNib_3/
RxRed
198
RxNib_2/RxAIS
XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
TYPE
O
O
DESCRIPTION
Receive Nibble Output - Bit 3/Receive Red Alarm Indicator:
The funtion of this output pin depends upon whether the XRT72L13 is
operating in the “Clear-Channel Framing/Nibble-Parallel” Mode or
not..
Clear Channel Framer Applications - Receive Nibble Output - Bit
3
The Framer IC will output "Received data (from the Remote Terminal)
to the local Terminal Equipment via this pin along with RxNib0,
RxNib1 and RxNib2.
The data at this pin is updated on the rising edge of the RxClk output
signal.
NOTE: This output pin is active only if the Nibble-Parallel Mode has
been selected.
All other Modes - Receiver Red Alarm Indicator:
The Framer asserts this output pin to denote that one of the following
events has been detected by the Receive Framer:
• LOS - Loss of Signal Condition
• OOF - Out of Frame Condition
• AIS - Alarm Indication Signal Detection
Receive Nibble Output - Bit 2/Receive AIS Condition Indicator:
The funtion of this output pin depends upon whether the XRT72L13 is
operating in the “Clear-Channel-Framing/Nibble-Parallel” Modes or
not.
Clear-Channel Framing/Nibble-Parallel Modes - Receive Nibble
Output - Bit 2
The Framer IC will output "Received data (from the Remote Terminal)
to the local Terminal Equipment via this pin along with RxNib0,
RxNib1 and RxNib2.
The data at this pin is updated on the rising edge of the RxClk output
signal.
All other Modes - Receive "Alarm Indication Signal" Output pin:
The Framer will assert this pin to indicate that the Alarm Indication
Signal (AIS) has been identified in the Receive DS3 data stream. An
"AIS" is detected if the payload consists of the recurring pattern of
1010... and this pattern persists for 63 M-frames. An additional
requirement for AIS indication is that the C-bits are set to 0, and the X-
bits are set to 1. This pin will be negated when a sufficient number of
frames, not exhibiting the "1010..." pattern in the payload has been
detected.
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