XRT83SL34 datasheet(53/80 Pages) EXAR

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XRT83SL34

QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

PRELIMINARY

REV. P1.0.8

TABLE 22: MICROPROCESSOR REGISTER #3, BIT DESCRIPTION

0000011

0010011

0100011

0110011

CHANNEL_n

CHANNEL_0

CHANNEL_1

CHANNEL_2

CHANNEL_3

FUNCTION

TYPE

RESET

VALUE

BIT #NAME

NLCDE1_n

Network Loop Code Detection Enable Bit 1:

This bit together with NLCDE0_n control the Loop-Code detec-

tion of each channel.

When NLCDE1 =”0” and NLCDE0 = “1” or NLCDE1 = “1” and

NLCDE0 = “0”, the chip is manually programmed to monitor

the receive data for the Loop-Up or Loop-Down code respec-

tively.When the presence of the “00001” or “001” pattern is

detected for more than 5 seconds, the status of the NLCD bit is

set to “1” and if the NLCD interrupt is enabled, an interrupt is

initiated.The Host has the option to control the Loop-Back

function manually.

Setting the NLCDE1 = “1” and NLCDE0 = “1” enables the

Automatic Loop-Code detection and Remote Loop-Back acti-

vation mode. As this mode is initiated, the state of the NLCD

interface bit is reset to “0” and the chip is programmed to mon-

itor the receive data for the Loop-Up code. If the “00001” pat-

tern is detected for longer than 5 seconds, the NLCD bit is set

“1”, Remote Loop-Back is activated and the chip is automati-

cally programmed to monitor the receive data for the Loop-

Down code. The NLCD bit stays set 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 seconds or if the Automatic Loop-Code detection

mode is terminated.

R/W

NLCDE0_n

Network Loop Code Detection Enable Bit 0:

See description of D7 for function of this bit.

R/W

CODES_n

Encoding and Decoding Select:

Writing a “0” to this bits selects HDB3 or B8ZS encoding and

decoding for channel number n. Writing “1” selects an AMI

coding scheme. This bit is only active when single rail mode is

selected.

R/W

NLCDE1

NLCDE0

Function

Disable Loop-code

detection

Detect Loop-Up code

in receive data

Detect Loop-Down

code in receive data

Automatic Loop-Code

detection

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