XRT83SL30IV(2003) View Datasheet(PDF) - Exar Corporation

Part Name

Description

Manufacturer

XRT83SL30IV
(Rev.:2003)

SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

Exar Corporation 

áç

XRT83SL30

SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

PRELIMINARY

REV. P1.0.4

ALARM FUNCTION/OTHER

SIGNAL NAME

ATAOS

ICT

NLCDE1

NLCDE0

PIN #

27

59

33

34

TYPE

I

I

I

DESCRIPTION

Automatic Transmit “All Ones” Pattern

In Hardware Mode, a "High" level on this pin enables the automatic trans-

mission of an "All Ones" AMI pattern from the transmitter when the receiver

has detected an LOS condition. A "Low" level on this pin disables this func-

tion.

NOTE: This pin is internally pulled “Low” with a 50kΩ resistor.

In-Circuit Testing (active "Low")

When this pin is tied “Low”, all output pins are forced to a “High” impedance

state for in-circuit testing.

Pulling RESET “Low” while ICT pin is also “Low” will put the chip in factory

test mode. This condition should never happen during normal operation.

NOTE: Internally pulled “High” with a 50kΩ resistor.

Network Loop Code Detection Enable pin 1

Network Loop Code Detection Enable pin 0

In Hardware Mode, NLCDE[1:0] pins are used to control the Loop-Code

detection according to the following table:

NLCDE1

0

0

1

1

NLCDE0

0

1

0

1

Function

Disable Loop-Code

Detection

Detect Loop-Up Code in

Receive Data

Detect Loop-Down Code in

Receive Data

Automatic Loop-Code

Detection

When NLCDE1=”0” and NCLDE0=”1”, or NLCDE1=”1” and NLCDE0=”0”, the

chip is manually programed to monitor the receive data for the Loop-Up or

Loop-Down code respectively. When the presence of the “00001” or “001”

pattern is detected for more than 5 seconds, the NLCD pin is set to “1” and

the Host has the option to activate the loop-back function manually.

Setting the NLCDE1=”1” and NLCDE0=”1” enables the Automatic Loop-

Code detection and Remote-Loop-Back activation mode. As this mode is ini-

tiated, the state of the NLCD pin is reset to “0” and the chip is programmed to

monitor the receive data for the Loop-Up Code. If the “00001” pattern is

detected for longer than 5 seconds, the NLCD pin is set to “1”, Remote Loop-

Back is activated and the chip is automatically programed to monitor the

receive data for the Loop-Down code. The NLCD pin stays “High” even after

the chip stops receiving the Loop-Up code. The remote Loop-Back condition

is removed when the chip receives the Loop-Down code for more than 5 sec-

onds or if the Automatic Loop-Code detection mode is terminated.

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