XRT72L13 datasheet(48/370 Pages) EXAR

48 / 370 page

XRT72L13

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

REV. P1.0.6

PRELIMINARY

199

RxNib_1/RxOOF

Receive Nibble Output - Bit 1/Receive “Out-Of-Frame” Indicator:

The funtion of this output pin depends upon whether the XRT72L13 is

operating in the “Clear-Channel-Framing/Nibble-Parallel” Mode or not.

Clear-Channel Framing/Nibble-Parallel Mode - Receive Nibble

Output - Bit 1:

The Framer IC will output "Received data (from the Remote Terminal)

to the local Terminal Equipment via this pin along with RxNib0,

RxNib2 and RxNib3.

The data at this pin is updated on the rising edge of the RxClk output

signal.

All other Modes - Receiver "Out of Frame" Indicator:

The Receive Section of the XRT72L13 M13 Multiplexer/Framer IC will

assert this output signal whenever it has declared an "Out of Frame"

(OOF) condition with the incoming DS3 frames. This signal is

negated when the framer correctly locates the framing alignment bits

or bytes and correctly aligns itself with the incoming DS3 frames.

200

GND

****

Ground Pin

201

RxNib_0/RxSer

Receive Nibble Output -Bit 0/Receive Serial Output:

The funtion of this output pin depends upon whether the XRT72L13 is

operating in the “Clear-Channel-Framing/Nibble-Parallel” Mode or in

the “Clear-Channel-Framing/Serial” Modes

Clear-Channel Framing/Nibble-Parallel Mode - Receive Nibble

Output - Bit 0:

The Framer IC will output "Received data (from the Remote Terminal)

to the local Terminal Equipment via this pin along with RxNib1,

RxNib2 and RxNib3.

The data at this pin is updated on the rising edge of the RxClk output

signal.

NOTE: In this case, the RxClk output signal is approximately

11.184MHz

Clear-Channel Framing/Serial Mode Receive Serial Output;

The Framer IC will output "Received data (from the Remote Terminal)

to the local Terminal Equipment via this pin.

The data at this pin is updated on the "selected" edge of the RxClk

output pin.

NOTES:

1. For “Serial-Mode” applications, the “RxClk” output signal is

44.736MHz.

2. If the XRT72L13 is operating in the “Channelized” or “High-

Speed HDLC Controller” modes, then this output pin is in-

active.

202

RxOutClk

Receive Out Clock - Transmit Terminal Interface Clock for Loop-

Timing:

This clock signal functions as the "Terminal Interface" clock source, if

the XRT72L13 M13 Multiplexer/Framer IC is operating in the "loop-

timing" mode.

In this mode, the Transmitting Terminal Equipment is expected to

input data to the Framer IC, via the TxSer input pin, upon the rising

edge of this clock signal. The XRT72L13 will use the rising edge of

this clock signal to sample the data at the TxSer input.

This clock signal is a buffered version of the RxLineClk signal.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT72L13 Datasheet(PDF) 48 Page - Exar Corporation

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