XRT72L50 Datasheet, PDF (356/471 Pages) Exar Corporation – SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER WITH HDLC CONTROLLER
REV. 1.2.1
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• Transmit Payload Data Input Interface block
• Transmit Overhead Data Input Interface block
• Transmit E3 Framer block
• Transmit HDLC Controller block
• Transmit LIU Interface block
Figure 143 presents a simple illustration of the Transmit Section of the XRT72L50 Framer IC.
FIGURE 143. THE TRANSMIT SECTION CONFIGURED TO OPERATE IN THE E3 MODE
TxOHFrame
TxOHEnable
TxOH
TxOHClk
TxOHIns
Transmit
OverhTeraadnsInmpiut t
InOtevrfearcheeBadloIcnkput
Interface Block
TxOHInd
TxSer
TxNib[3:0]
TxInClk
TxNibClk
TxFrame
TxNibFrame
TxFrameRef
Transmit
PaylToaradnDsamtait
PaInyplouatd Data
InterfacInepBultock
Interface Block
Transmit DS3/E3
FTrraamnsemr BitlDocSk3/E3
Framer Block
Transmit LIU
ITnrtaenrfsamceit ^LIU
BInlotecrkface
Block
TxPOS
TxNEG
TxLineClk
From Microprocessor
Interface Block
Transmit E3
THraDnLsCmit E3
ControlHleDr/LBCuffer
Controller/Buffer
Each of these functional blocks will be discussed in detail in this document.
6.2.1 The Transmit Payload Data Input Interface Block
Figure 144 presents a simple illustration of the Transmit Payload Data Input Interface block.
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