XR72L52 Datasheet, PDF (259/480 Pages) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
FIGURE 86. THE XRT72L52 TRANSMIT SECTION CONFIGURED TO OPERATE IN THE E3 MODE
TxOHFrame
TxOHEnable
TxOH
TxOHClk
TxOHIns
TxOHInd
TxSer
TxNib[3:0]
TxInClk
TxNibClk
TxFrame
TxNibFrame
TxFrameRef
Transmit
OverhTeraandsInmpiut t
InOtevrfearcheeBadloIcnkput
Interface Block
Transmit
PaylToaradnDsamtait
PaInyplouatd Data
InterfacInepBultock
Interface Block
Transmit DS3/E3
FTrraamnsemr BitlDocSk3/E3
Framer Block
Transmit LIU
ITnrtaenrfsamceit ^LIU
BInlotecrkface
Block
XRT72L52
REV. 1.0.1
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.
5.2.1 The Transmit Payload Data Input Interface Block
Figure 87 presents a simple illustration of the Transmit Payload Data Input Interface block.
FIGURE 87. THE TRANSMIT PAYLOAD DATA INPUT INTERFACE BLOCK
TxOH_Ind
TxSer
TxNib[3:0]
TxInClk
TxNibClk
TxNibFrame
TxFrame
TxFrameRef
Transmit
Payload Data
Input Interface
Block
To Transmit E3
Framer Block
Each of the input and output pins of the Transmit Payload Data Input Interface are listed in Table 43 and de-
scribed below. The exact role that each of these inputs and output pins assume, for a variety of operating sce-
narios are described throughout this section.
243