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XRT86VL32IB Datasheet(PDF) 30 Page - Exar Corporation

Part # XRT86VL32IB
Description  T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
PDF  154 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT86VL32IB Datasheet(HTML) 30 Page - Exar Corporation

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XRT86VL3X
23
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
REV. 1.2.3
3.3
Programming Sequence for Receiving LAPD Messages
The XRT86VL3x can extract data link information from incoming DS1 frames from either the datalink bits
themselves or the D/E time slots within the PCM input data.
To extract a LAPD message, the following
programming sequence can be used as a reference.
FIGURE 31. RECEIVING HDLC MESSAGES
Enable RxSOT, RxEOT, and
RxIDLE
RxSOT Indicates a Start of a
New Message, go to Next
Step
Wait for RxEOT or RxIDLE
If INT = RxIDLE
Read RxBYTE Count
Register to Determine
Available Buffer
Read the Buffer to Retrieve
the Message
Read RxBYTE Count
Register to Determine
Available Buffer
Read the Buffer to Retrieve
the Message
YES, RxIDLE
NO, RxEOT



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