XRT75L00 datasheet(9/50 Pages) EXAR

9 / 50 page

XRT75L00

REV. 1.0.2

E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

RNEG/LCV

Receive Negative Data Output/Line Code Violation Indicator

Function of these pins depends on whether the XRT75L00 is configured in

Single Rail or Dual Rail mode.

If the XRT75L00 is configured in Dual Rail mode, a negative pulse is output

through RNEG.

In Hardware mode: Tie the pin SR/DR (pin 22) “High” to configure the

XRT75L00 in Single Rail mode and tie “Low” to configure in Dual Rail mode.

In HOST mode: XRT75L00 can be configured in Single Rail or Dual Rail by set-

ting or clearing the bit in the block control register.

Line Code Violation Indicator

If the XRT75L00 is configured in Single Rail mode then:

Whenever the Receiver Section detects a Line Code violation, it pulses this

output pin “High”. This output pin remains “Low” at all other times.

It is

advisable to sample this output pin using the RxClk output signal.

RRING

Receive Ring Input

This input pin along with RTIP is used to receive the bipolar line signal from the

Remote DS3/E3/STS-1 Terminal.

RTIP

Receive TIP Input

This input pin along with RRNG is used to receive the bipolar line signal from

the Remote DS3/E3/STS-1 Terminal.

RxMON/

SDO

Receive Monitoring Mode or Serial Data Output:

In Hardware mode, when this pin is tied “High” XRT75L00 configures into mon-

itoring channel. In the monitoring mode, the Receiver is capable of monitoring

the signals with 20 dB flat loss plus 6 dB cable attenuation. This allows to moni-

tor very weak signal before declaring LOS.

In HOST Mode, XRT75L00 can be configured to be a monitoring channel by

setting the bits in the receive control register.

NOTE: If the XRT75L00 is configured in HOST mode, this pin functions as SDO

pin (please refer to the pin description for the Microprocessor Interface).

RECEIVE INTERFACE

PIN #SIGNAL NAME

TYPE

DESCRIPTION

XRT75L00 Datasheet(PDF) 9 Page - Exar Corporation

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