XRT7250 Datasheet, PDF (151/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

XRT7250 DS3/E3 FRAMER IC
REV. 1.1.1
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FIGURE 42. A SIMPLE ILLUSTRATION OF THE TRANSMIT SECTION, WITHIN THE XRT7250, WHEN IT HAS BEEN CON-
FIGURED TO OPERATE IN THE DS3 MODE
TxOHFrame
TxOHEnable
TxOH
TxOHClk
TxOHIns
TxOHInd
TxSer
TxNib[3:0]
TxInClk
TxNibClk
TxFrame
Transmit Overhead
Input
Interface Block
Transmit
Payload Data
Input
Interface Block
Transmit DS3/E3
Framer Block
Transmit LIU
Interface
Block
TxPOS
TxNEG
TxLineClk
From Microprocessor
Interface Block
TTxxDDSS33HHDDLLCC
CConontrtorlollelre/rB/Buufffefrer
Each of these functional blocks will be discussed in
detail in this document.
4.2.1 The Transmit Payload Data Input Interface
Block
Figure 43 presents a simple illustration of the Trans-
mit Payload Data Input Interface block.
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