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XRT7250 Datasheet(PDF) 430 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 430 Page - Exar Corporation |
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430 / 463 page  áç áç áç áç XRT7250 DS3/E3 FRAMER IC REV. 1.1.1 411 FIGURE 201. FLOW CHART DEPICTING THE FUNCTIONALITY OF THE LAPD RECEIVER START Indicate whether the LAPD Receiver should retrieve the LAPD Message frame octets from the NR or GC byte-field, within each incoming E3 Frame. Enable the LAPD Receiver The LAPD Receiver will begin searching for the Flag Sequence octet (0x7E) in the “selected” byte-field (e.g., NR or GC) of each incoming E3 frame. Is Flag Sequence octet Present? Assert the “Flag Present” bit-field within the “Rx E3 LAPD Status Register (Address = 0x19). Is non-Flag Sequence octet detected ? Set the “RxLAPDType[1:0] bit-fields to the appropriate value. Continue to read in the LAPD Message frame octets Is Abort Sequence Detected? Has the last byte of the LAPD Message frame been received? Set the “End Of Message” bit-field within the “RxE3 LAPD Status Register (Address = 0x19) Unstuff the “PMDL” portion of the LAPD Message frame. Goto Figure 185 No A Yes No Yes No Yes No Yes |
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