XRT5997 datasheet(7/37 Pages) EXAR

7 / 37 page

XRT5997

Rev. 1.0.0

PIN DESCRIPTION (CONT'D)

Pin#

Symbol

Type

Description

RxNEG3

Receiver 3 Negative Data Out:

This output pin will pulse “high” whenever Channel 3, within the XRT5997

device has received a “Negative Polarity” pulse, in the incoming line signal,

at RTIP3/RRing3 inputs.

TxPOS2

Transmitter - Positive Data Input – Channel 2:

The exact signal that should be applied to this input pin depends upon

whether the user intends to operate the “Transmit Section” (of Channel 2) in

the “Clocked” or “Clockless” Mode.

Clocked Mode:

The Terminal Equipment should apply bit-wide NRZ pulses on this input pin,

whenever the Terminal Equipment needs to transmit a “positive-polarity”

pulse onto the line via TTIP2 and TRing2 output pins). The XRT5997

device will sample this input pin upon the falling edge of the TClk2 signal.

Clockless Mode:

The Terminal Equipment should apply RZ pulses to this input pin, anytime

the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the

line via TTIP2 and TRing2 output pins.

TxNEG2

Transmitter - Negative Data Input – Channel 2:

The exact signal that should be applied to this input pin depends upon

whether the user intends to operate the “Transmit Section” (of the Channel 2)

in the “Clocked” or “Clockless” Mode.

Clocked Mode:

The Terminal Equipment should apply bit-wide NRZ pulses on this input pin,

whenever the Terminal Equipment needs to transmit a “negative-polarity”

pulse onto the line via TTIP2 and TRing2 output pins. The XRT5997

device will sample this input pin upon the falling edge of the TClk2 signal.

Clockless Mode:

The Terminal Equipment should apply RZ pulses to this input pin, anytime the

Terminal Equipment needs to transmit a “negative-polarity” pulse onto the

line via TTIP2 and TRing2 output pins.

TxClk2

Transmitter Clock Input – Channel 2:

If the user operates Channel 2 (within the XRT5997 device) in the “clocked”

mode, then the “Transmit Section” of the Channel 2 will use the falling edge

of this signal to sample the data at the TxPOS2 and TxNEG2 input pins.

Note If the user operates the Channel 2 in the “clockless” mode, then the

Terminal Equipment should not apply a clock signal to this input pin.

Note: 1 Internally pull-up with 50K resistor.

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