XRT83L38 Datasheet, PDF(59/91 Page) Exar Corporation – OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT83L38 Datasheet, PDF (59/91 Pages) Exar Corporation – OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT83L38

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

REV. 1.0.0

TABLE 22: MICROPROCESSOR REGISTER #3, BIT DESCRIPTION

00000011

00010011

00100011

00110011

01000011

01010011

01100011

01110011

CHANNEL_n

CHANNEL_0

CHANNEL_1

CHANNEL_2

CHANNEL_3

CHANNEL_4

CHANNEL_5

CHANNEL_6

CHANNEL_7

FUNCTION

TYPE

RESET

VALUE

BIT #

NAME

NLCDE1_n Network Loop Code Detection Enable Bit 1:

R/W

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

tion of each channel.

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

When NLCDE1 =â0â and NLCDE0 = â1â or NLCDE1 = â1â and

NLCDE0 = â0â, 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 â00001â or â001â pattern is

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

set to â1â 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 = â1â and NLCDE0 = â1â 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 â0â and the chip is programmed to mon-

itor the receive data for the Loop-Up code. If the â00001â pat-

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

â1â, 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.

NLCDE0_n Network Loop Code Detection Enable Bit 0:

See description of D7 for function of this bit.

R/W

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