XRT72L13 datasheet(45/370 Pages) EXAR

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XRT72L13

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

PRELIMINARY

REV. P1.0.6

184

RLOL

Receive Loss of Lock Indicator - from the XRT7300 DS3/E3 Line

Interface Unit IC.

This input pin is intended to be connected to the RLOL (Receive Loss

of Lock) output pin of the XRT7300 Line Interface Unit IC. The user

can monitor the state of this pin by reading the state of Bit 1 (RLOL)

within the Line Interface Scan Register (Address = 0x81).

If this input pin is "low", then it means that the "clock recovery phase-

locked-loop" circuitry, within the XRT7300 is properly locked onto the

incoming DS3 data-stream; and is properly recovering clock and data

from this DS3 data-stream. However, if this input pin is "high", then it

means that the phase-locked-loop circuitry, within the XRT7300 has

lost lock with the incoming DS3 data-stream, and is not properly

recovering clock and data.

For more information on the operation of the XRT7300 DS3/E3 Line

Interface Unit IC, please consult the "XRT7300 DS3/E3 Line Interface

Unit" data sheet.

NOTE: This output pin can be used for a variety of other purposes if

the XRT7300 DS3/E3 LIU is not used.

185

ExtLOS

Receive LOS (Loss of Signal) Indicator Input (from XRT7300 LIU

IC).

This input pin is intended to be connected to the RLOS (Receive Loss

of Signal) output pin of the XRT7300 Line Interface Unit IC. The user

can monitor the state of this pin by reading the state of Bit 0 (RLOS)

within the Line Interface Scan Register (Address = 0x81).

If this input pin is "low", then it means that the XRT7300 is currently

NOT declaring an "LOS (Loss of Signal) condition. However, if this

input pin is "high", then it means that the XRT7300 is currently declar-

ing an LOS (Loss of Signal) condition.

For more information on the operation of the XR-T7300 DS3/E3 Line

Receiver IC, please consult the "XRT7300 DS3/STS-1/E3 Line Inter-

face Unit IC" data sheet.

NOTE: Asserting the RLOS input pin will cause the XRT72L13 M13

Multiplexer/Framer to declare an "LOS (Loss of Signal) condition.

Therefore, this input pin should not be used as a general purpose

input.

186

VDD

****

Power Supply Pin

187

RxVCOup

Receive VCO Frequency Increase:

188

RxVCOdown

Receive VCO Frequency Decrease:

189

RxLineClk

Receiver LIU (Recovered) Clock:

This input signal serves three purposes:

The Receive Framer uses it to sample and "latch" the signals at the

RxPOS and RxNEG input pins (into the Receive Framer circuitry).

This input signal functions as the timing reference for the Receive

Framer block.

The Transmit Framer block can be configured to use this input signal

as its timing reference.

NOTE: This signal is the recovered clock from the external DS3 LIU

(Line Interface Unit) IC, which is derived from the incoming DS3 data.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT72L13 Datasheet(PDF) 45 Page - Exar Corporation

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