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XRT7250 Scheda tecnica(PDF) 430 Page - Exar Corporation

Il numero della parte XRT7250
Spiegazioni elettronici  DS3/E3 FRAMER IC
PDF  463 Pages
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Produttore elettronici  EXAR [Exar Corporation]
Homepage  http://www.exar.com
Logo EXAR - Exar Corporation

XRT7250 Scheda tecnica(HTML) 430 Page - Exar Corporation

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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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