XRT72L13 Datasheet, PDF (298/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
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PRELIMINARY
FIGURE 91. A SIMPLE ILLUSTRATION OF THE RECEIVE SECTION OF THE XRT72L13, WHEN IT HAS BEEN CONFIG-
URED TO OPERATE IN THE DS3 MODE
RxOHFrame
RxOHEnable
RxOH
RxOHClk
RxOHInd
RxSer
RxNib[3:0]
RxClk
RxFrame
Receive Overhead
Input
Interface Block
Receive Payload
Data Input
Interface Block
Receive DS3/E3
Framer Block
Receive LIU
Interface
Block
RxPOS
RxNEG
RxLineClk
From Microprocessor
Interface Block
RRxxDDSS33HHDDLLCC
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Each of these functional blocks will be discussed in
detail in this document.
4.3.1 The Receive DS3 LIU Interface Block
The purpose of the Receive DS3 LIU Interface block
is two-fold:
1. To receive "encoded" digital data from the DS3
LIU IC.
2. To decode this data, convert it into a binary data
stream and to route this data to the "Receive DS3
Framer" block.
Figure 92 presents a simple illustration of the "Re-
ceive DS3 LIU Interface" block.
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