XRT83L30 Datasheet, PDF (17/78 Pages) Exar Corporation – SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
PRELIMINARY
REV. P1.3.0
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 transmis-
sion 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 function.
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
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
INSBPV
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.
35
I
Insert Bipolar Violation
When this pin transitions from "0" to "1", a bipolar violation is inserted in the
transmitted data stream. Bipolar violation can be inserted either in the QRSS
pattern, or input data when operating in single-rail mode. The state of this pin
is sampled on the rising edge of TCLK.
NOTE: To ensure the insertion of a bipolar violation, this pin should be reset
to a "0" prior to setting to a "1".
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