XRT73LC00 Datasheet, PDF(48/53 Page) Exar Corporation

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

XRT73LC00 Datasheet, PDF (48/53 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT

◁

XRT73LC00

E3/DS3/STS-1 LINE INTERFACE UNIT

REV. P1.0.1

Ã¡Ã§

PRELIMINARY

Bit D2 - ALOS (Analog Loss of Signal Status)

This Read-Only bit-field indicates whether or not the

Analog LOS Detector in the XRT73LC00 is currently

declaring an LOS condition.

This bit-field is set to â0â if the Analog LOS Detector in

the XRT73LC00 is NOT currently declaring an LOS

condition. Conversely, this bit-field is set to â1â if the

Analog LOS Detector is currently declaring an LOS

condition.

The purpose of this feature is to isolate either the An-

alog LOS or the Digital LOS detector that is declaring

the LOS condition. This feature may be useful for

troubleshooting/debugging purposes.

Bit D1 - DLOS (Digital Loss of Signal Status)

This Read-Only bit-field indicates whether or not the

Digital LOS Detector in the XRT73LC00 is currently

declaring an LOS condition.

This bit-field is set to â0â if the Digital LOS Detector in

the XRT73LC00 is NOT currently declaring an LOS

condition. Conversely, this bit-field is set to â1â if the

Digital LOS Detector is currently declaring an LOS

condition.

NOTE: The purpose of this feature is to isolate the Detector

(e.g., either the Analog LOS or the Digital LOS detector)

that is declaring the LOS condition. This feature may be

useful for troubleshooting/debugging purposes.

Bit D0 - DMO (Drive Monitor Output Status)

This Read-Only bit-field reflects the status of the

DMO output pin.

5.1.2 Command Register - CR1

Bit D4 - TXOFF (Transmitter OFF)

This Read/Write bit-field is used to turn off the Trans-

mitter in the XRT73LC00.

Writing a â1â to this bit-field turns off the Transmitter

and tri-states the Transmit Output. Writing a â0â to

this bit-field turns on the Transmitter.

Bit D3 - TAOS (Transmit All OneS)

This Read/Write bit-field is used to command the

XRT73LC00 Transmitter to generate and transmit an

all â1âsâ pattern onto the line.

Writing a â1â to this bit-field commands the Transmit-

ter to transmit an all â1âsâ pattern onto the line. Writ-

ing a â0â to this bit-field commands normal operation.

Bit D2 - TXCLKINV (Transmit Clock Invert)

This Read/Write bit-field is used to configure the

XRT73LC00 Transmitter to sample the signal at the

TPDATA and TNDATA pins on the rising or falling

edge of TCLK (the Transmit Line Clock signal).

Writing a â1â to this bit-field configures the Transmitter

to sample the TPDATA and TNDATA input pins on the

rising edge of TCLK. Writing a â0â to this bit-field con-

figures the Transmitter to sample the TPDATA and

TNDATA input pins on the falling edge of TCLK.

Bit D1 - TXLEV (Transmit Level Select)

This Read/Write bit-field is used to enable or disable

the XRT73LC00 Transmit Line Build-Out circuit.

Setting this bit-field "High" disables the Line Build-Out

circuit of the XRT73LC00. In this mode, the

XRT73LC00 outputs partially-shaped pulses onto the

line via the TTIP and TRING output pins. Setting this

bit-field "Low" enables the Line Build-Out circuit of the

XRT73LC00. In this mode the XRT73LC00 outputs

shaped pulses onto the line via the TTIP and TRING

output pins.

To comply with the Isolated DSX/STSX-1 Pulse Tem-

plate Requirements per Bellcore GR-499-CORE or

GR-253-CORE, either:

1. set this input pin to "1" if the cable length between

the Cross-Connect and the transmit output of the

XRT73LC00 is greater than 225 feet or

2. set this input pin to "0" if the cable length between

the Cross-Connect and the transmit output of the

XRT73LC00 is less than 225 feet.

NOTE: This option is only available when the XRT73LC00 is

operating in the DS3 or STS-1 Mode.

Bit D0 - TXBIN (Transmit Binary Data)

This Read/Write bit-field permits configuring of the

Transmitter in the XRT73LC00 to accept an un-en-

coded binary data stream via the TPDATA input and

converts this data into the appropriate bipolar signal

to the line.

Writing a â1â configures the Transmitter to accept a bi-

nary data stream via the TPDATA input.

NOTE: The TNDATA input is ignored.

This form of data acceptance is sometimes referred

to as Single-Rail mode operation. The Transmitter

then encodes this data into the appropriate line code

(e.g., B3ZS or HDB3) prior to its transmission over

the line.

Writing a â0â configures the Transmitter to accept data

in a Dual-Rail manner (e.g., via both the TPDATA and

TNDATA inputs).

▷