XRT83SL314 datasheet(56/83 Pages) EXAR

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XRT83SL314

REV. 1.0.1

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

0x1Dh

E1 Short Haul/15dB

ITU G.703

120

Ω TP

HDB3

0x1Eh

E1 Gain Mode/29dB

ITU G.703

Ω Coax

HDB3

0x1Fh

E1 Gain Mode/29dB

ITU G.703

120

Ω TP

HDB3

TABLE 26: MICROPROCESSOR REGISTER 0X01H BIT DESCRIPTION

CHANNEL 0-13 (0X01H-0XD1H)

BIT

NAME

FUNCTION

Type

Default

Value

(HW reset)

RxTSEL

Receive Termination Select

Upon power up, the receiver is in "High" impedance. RxTSEL is

used to switch between the internal termination and "High" imped-

ance.

0 = "High" Impedance

1 = Internal Termination

R/W

TxTSEL

Transmit Termination Select

Upon power up, the transmitter is in "High" impedance. TxTSEL is

used to switch between the internal termination and "High" imped-

ance.

0 = "High" Impedance

1 = Internal Termination

R/W

TERSEL1

TERSEL0

Receive Line Impedance Select

TERSEL[1:0] are used to select the line impedance for T1/J1/E1.

00 = 100

Ω

01 = 110

Ω

10 = 75

Ω

11 = 120

Ω

R/W

RxJASEL

Receive Jitter Attenuator Select

RxJASEL is used to enable the receiver jitter attenuator.

default, RxJASEL is disabled.

0 = Disabled

1 = Enabled

R/W

TxJASEL

Transmit Jitter Attenuator Select

TxJASEL is used to enable the transmitter jitter attenuator. By

default, TxJASEL is disabled.

0 = Disabled

1 = Enabled

R/W

TABLE 25: EQUALIZER CONTROL AND TRANSMIT LINE BUILD OUT

EQC[4:0]

T1/E1 MODE/RECEIVE SENSITIVITY

TRANSMIT LBO

CABLE

CODING

XRT83SL314 Datasheet(PDF) 56 Page - Exar Corporation

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