XRT5997 datasheet(13/37 Pages) EXAR

13 / 37 page

XRT5997

Rev. 1.0.0

PIN DESCRIPTION (CONT'D)

Pin#

Symbol

Type

Description

TxNEG6

Transmitter - Negative Data Input – Channel 6:

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 6)

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 TTIP6 and TRing6 output pins. The XRT5997

device will sample this input pin upon the falling edge of the TClk6 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 TIP6 and TRing6 output pins.

TxClk6

Transmitter Clock Input – Channel 6:

If the user operates Channel 6 (within the XRT5997 device) in the “clocked”

mode, then the “Transmit Section” of the Channel 6 will use the falling edge of

this signal to sample the data at the TxPOS6 and TxNEG6 input pins.

Note: If the user operates the Channel 6 in the “clockless” mode, then the

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

TGND6

Digital Ground. Transmitters 6.

TTIP6

Transmitter 6 Positive Bipolar Output:

Channel 6 within the XRT5997 device will use this pin, along with TRing6, to

transmit a bipolar line signal, via a 1:2 step-up transformer.

TVDD6

Positive Supply (+3.3V ± 5%), Transmitters 6.

TRing6

Transmitter 6 Negative Bipolar Output:

Channel 6 within the XRT5997 device will use this pin, along with TTIP6, to

transmit a bipolar line signal, via a 1:2 step-up transformer.

DGND

Digital Ground. Digital Circuitry.

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