XRT72L13 Datasheet, PDF (71/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

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PRELIMINARY
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC XRT72L13
REV. 1.0.6
FIGURE 29. FUNCTIONAL BLOCK DIAGRAM OF THE XRT72L13 M13 MULTIPLEXER/FRAMER IC, WHILE OPERATING
IN THE “CLEAR CHANNEL DS3 FRAMER MODE”
TxOHFrame
TxOHEnable
TxOH
TxOHClk
TxOHIns
TxOHInd
TxSer
TxNib[3:0]
TxInClk
TxNibClk
TxFrame
MOTO
D[7:0]
A[8:0]
IntB*
CSB*
RdB_DS
WrB_RW
Rdy_Dtck
Reset*
ALE_AS
RxOHInd
RxSer
RxNib[3:0]
RxOutClk
RxNibClk
RxFrame
RxOHFrame
RxOH
RxOHClk
RxOHEnable
Transmit Overhead
Input
Interface Block
Transmit Payload
Data Input
Interface Block
Transmit DS3
Framer Block
Microprocessor
Interface
Receive Payload
Data Output
Interface Block
Receive Overhead
Output
Interface Block
Tx LAPD Buffer/
Controller
Rx LAPD Buffer/
Controller
Receive DS3
Framer Block
Transmit
LIU
Interface
Block
TxPOS
TxNEG
TxLineClk
Receive LIU
Interface
Block
RxPOS
RxNEG
RxLineClk
As this mode implies, the "Clear Channel DS3 Framer
Mode" permits the user to transmit and receive any
type of data over the DS3 Transport Medium.
1.2.1 Operation of the XRT72L13 while in the
"Clear Channel DS3 Framer Mode"
To be provided in the next update.
1.2.1.1 Diagnostic Features
When the XRT72L13 is operating in the "Clear Chan-
nel DS3 Framer" Mode, then the following diagnostic
features are available.
• Local Loop-back Mode
• Remote Loop-back Mode
• PRBS Pattern Generation/Reception
1.2.1.1.1 Local Loop-back Mode
Figure 30 presents an illustration of the XRT72L13
operating in the Local-Loop-back Mode.
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