XRT75VL00D datasheet(9/92 Pages) EXAR

9 / 92 page

XRT75VL00D

REV. 1.0.3

E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

PIN DESCRIPTIONS (BY FUNCTION)

TRANSMIT INTERFACE

PIN #SIGNAL NAME

TYPE

DESCRIPTION

4TxON

Transmitter ON Input

Setting this input pin "High" turns on the Transmitter.

NOTES:

Even when the XRT75VL00D is configured in HOST mode, this pin still

controls the TTIP and TRING outputs

When the Transmitter is turned off either in Host or Hardware

mode,the TTIP and TRING outputs are Tri-stated.

This pin is internally pulled down

TxClk

Transmit Clock Input for TPData and TNData

The frequency accuracy of this input clock must be of nominal bit rate ± 20 ppm.

The duty cycle can be 30%-70%.

The XRT75VL00D samples the TPData and TNData pins on the falling or rising

edge of TxClk signal based on the status of TxClkINV pin (in Hardware mode)

or the status of the bit in the Channel Register (in HOST mode).

TxClkINV/

SClk

Transmit Clock Invert or Serial Clock Input:

Function of this depends on whether the XRT75VL00D is configured to operate

in Hardware mode or Host mode.

In Hardware mode, setting this input pin “High” configures the Transmitter to

sample the TPData and TNData data on the rising edge of the TxClk.

NOTE: If the XRT75VL00D is configured in HOST mode, this pin functions as

SClk input pin (please refer to the pin description for Microprocessor

interface).

TNData

Transmit Negative Data Input

If the XRT75VL00D is configured in Dual-rail mode, this pin is sampled on the

falling or rising edge of TxClk based on the status of the TClkINV pin (in Hard-

ware mode) or the status of the control bit in the Channel Register (in HOST

mode).

NOTES:

This input pin is ignored and should be tied to GND if the Transmitter

Section is configured to accept Single-Rail data from the Terminal

Equipment.

TPData

Transmit Positive Data Input

The XRT75VL00D samples this pin on the falling or rising edge of TxClk based

on the status of the TClkINV pin (in Hardware mode) or the status of the control

bit in the Channel Register (in HOST mode).

TTIP

Transmit TTIP Output

The XRT75VL00D uses this pin along with TRING to transmit a bipolar signal to

the line using a 1:1 transformer.

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