XRT75R03D datasheet(9/134 Pages) EXAR

9 / 134 page

XRT75R03D

THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER

REV. 1.0.2

PIN DESCRIPTIONS (BY FUNCTION)

SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS

PIN #SIGNAL NAME

TYPE

DESCRIPTION

125

TxON_0

TxON_1

TxON_2

Transmitter ON Input - Channel 0:

Transmitter ON Input - Channel 1:

Transmitter ON Input - Channel 2:

These input pins are used to either enable or disable the Transmit Output

Driver corresponding to Channel_n.

"Low" - Disables the Transmit Output Driver of the corresponding Channel.

In this setting, the corresponding TTIP_n and TRING_n output pins will be

tri-stated.

"High" - Enables the Transmit Output Driver of the corresponding Channel.

In this setting, the corresponding TTIP_n and TRING_n output pins will be

enabled.

NOTES:

Even when the XRT75R03D is configured in HOST mode, these

pins will be active. To enable software control of the Transmit

Output Driver outputs, pull these pins "High".

When Transmitters are turned off either in Host or Hardware

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

These pins are internally pulled "High"

TxClk_0

TxClk_1

TxClk_2

Transmit Clock Input - Channel 0:

Transmit Clock Input f - Channel 1:

Transmit Clock Input - Channel 2:

These input pins have two functions:

• They function as the timing source for the Transmit Section of the

corresponding channel within the XRT75R03D.

• They also are used by the Transmit Section of the LIU IC to sample the

corresponding TPDATA_n and TNDATA_n input pin.

NOTE: The user is expected to supply a 44.736MHz ± 20ppm clock signal

(for DS3 applications), 34.368MHz ± 20 ppm clock signal (for E3

applications) or a 51.84MHz ± 4.6ppm clock signal (for STS-1,

Stratum 3E or better applications).

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