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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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XRT7250 Scheda tecnica(PDF) 327 Page - Exar Corporation |
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XRT7250 Scheda tecnica(HTML) 327 Page - Exar Corporation |
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327 / 463 page  XRT7250 áç áç áç áç DS3/E3 FRAMER IC REV. 1.1.1 308 5.3.4 The Receive Overhead Data Output Inter- face Figure 144 presents a simple illustration of the Re- ceive Overhead Data Output Interface block within the XRT7250. FIGURE 143. FLOW CHART DEPICTING THE FUNCTIONALITY OF THE LAPD RECEIVER START START ENABLE THE LAPD RECEIVER This is done by writing the value “xxxx x1xx” into the RxLAPD Control Register (Address = 0x18) LAPD Receiver begins reading in the N bits from each inbound E3 frame Does the LAPD Receiver detect 6 consecutive Zeros ? Does the LAPD Receiver detect 6 consecutive Zeros ? Does the LAPD Receiver detect 7 consecutive Zeros ? Does the LAPD Receiver detect 7 consecutive Zeros ? Flag Sequence Flag Sequence ABORT Sequence ABORT Sequence LAPD Receiver is reading in a LAPD Message Frame, containing a PMDL Message. LAPD Receiver is reading in a LAPD Message Frame, containing a PMDL Message. Does the LAPD Receiver detect 6 consecutive Zeros ? Does the LAPD Receiver detect 6 consecutive Zeros ? Does the LAPD Receiver detect 7 consecutive Zeros ? Does the LAPD Receiver detect 7 consecutive Zeros ? End of Message (EOM) End of Message (EOM) VERIFY THE FCS VALUE Report results in the RxLAPD Status Register.. VERIFY THE FCS VALUE Report results in the RxLAPD Status Register.. “Un-stuff contents of Received Message” “Un-stuff contents of Received Message” Write Received PMDL Message into the Receive LAPD Message Buffer (Addresses 0xDE - 0x135) Write Received PMDL Message into the Receive LAPD Message Buffer (Addresses 0xDE - 0x135) Generate “Received LAPD Interrupt” Generate “Received LAPD Interrupt” Execute Receive LAPD Interrupt Service Routine Execute Receive LAPD Interrupt Service Routine 1 1 1 1 NO YES NO YES YES NO YES NO |
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