XRT75VL00D datasheet(45/92 Pages) EXAR

45 / 92 page

XRT75VL00D

REV. 1.0.3

E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

0x05

R/W

REQEN

Setting this bit to “1” enables the Receive Equalizer .

NOTE: See section 2.01 for detailed description.

RxMON

Writing a “1” to this bit configures the Receiver into

monitoring mode. In this mode, the Receiver can

monitor a signal at the RTIP/RRing pins that be atten-

uated up to 20dB flat loss.

LOSMUT

Writing a “1” to this bit causes the RPOS/RNEG out-

puts to be grounded while the LOS condition is

declared.

NOTE: If this bit has ben set, it will remain set evan

after LOS condition is cleared.

RxClkINV

Writing a “1” to this bit configures the Receiver to out-

put RPOS/RNEG data on the falling edge of RxClk.

ALOSDIS

Writing a “1” to this bit disables the ALOS detector.

DLOSDIS

Writing a “1” to this bit disables the DLOS detector.

0x06

R/W

SR/DR

Writing a “1” to this bit configures the Receiver and

Transmitter into Single-Rail (NRZ) mode.

STS-1/DS3

Writing a “1” to this bit configures the channel 0 into

STS-1 mode.

NOTE: This bit field is ignored if the chip is configured

to operate in E3 mode.

Writing a “1” to this bit configures the chip in E3

mode.

LLB

Writing a “1” to this bit configures the chip in Local

Loopback mode.

RLB

Writing a “1” to this bit configures the chip in Remote

Loopback mode.

PRBSEN

Writing a “1” to this bit enables the PRBS generator/

detector.PRBS generator generate and detect either

215-1 (DS3 or STS-1) or 223-1 (for E3).

The pattern generated and detected are unframed

pattern.

TABLE 16: REGISTER MAP DESCRIPTION

ADDRESS

(HEX)

TYPE

BIT LOCATION

SYMBOL

DESCRIPTION

DEFAULT

VALUE(BIN)

RLB

Loopback Mode

Normal Operation

Analog Local

LLB

Remote

Digital

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