XRT75L02 datasheet(13/50 Pages) EXAR

13 / 50 page

XRT75L02

TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER

REV. 1.0.3

MODE SELECT

PIN #

SIGNAL NAME

TYPE

DESCRIPTION

E3_0

E3_1

E3 Mode Select Input

A "High" on this pin configures in E3 mode.

A "Low" on this pin configures in either STS-1 or DS3 mode depending on the

settings on pins 3 and 23..

NOTES:

This pin is internally pulled down

This pin is ignored if configured to operate in HOST mode.

STS1/DS3 _0

STS1/DS3 _1

STS-1/DS3 Select Input

A “High” on these pins configures in STS-1 mode.

A “Low” on these pins configures in DS3 mode.

These pins are ignored if the E3_n pins are set to “High”.

NOTES:

This pin is internally pulled down

This pin is ignored if configured to operate in HOST mode.

HOST/HW

Host/Hardware Mode:

Tie this pin “High” to configure in Host mode and “Low” for Hardware mode.

100

SR/DR

Single-Rail/Dual-Rail Select:

Setting this “High” configures both the Transmitter and Receiver to operate in

Single-rail mode and also enables the B3ZS/HDB3 Encoder and Decoder. In

Single-rail mode, TNEG_n pin should be grounded.

Setting this “Low” configures both the Transmitter and Receiver to operate in

Dual-rail mode and disables the B3ZS/HDB3 Encoder and Decoder.

NOTE: This pin is internally pulled down.

MICROPROCESSOR SERIAL INTERFACE - (HOST MODE)

PIN #

SIGNAL NAME

TYPE

DESCRIPTION

RxCLKINV

Microprocessor Serial Interface - Chip Select

Tie this “Low” to enable the communication with the Microprocessor Serial Inter-

face.

NOTE: If configured in Hardware Mode, this pin functions as RxClkINV.

SCLK

TxCLKINV

Serial Interface Clock Input

The data on the SDI pin is sampled on the rising edge of this signal. Addition-

ally, during Read operations the Microprocessor Serial Interface updates the

SDO output on the falling edge of this signal.

NOTE: If configured in Hardware Mode, this pin functions as TxClkINV.

SDI

RxON

Serial Data Input:

Data is serially input through this pin.

The input data is sampled on the rising edge of the SClk. .

NOTES:

This pin is internally pulled down

If configured in Hardware Mode, this pin functions as RxON.

XRT75L02 Datasheet(PDF) 13 Page - Exar Corporation

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