XRT73LC00 datasheet(9/53 Pages) EXAR

9 / 53 page

áç

XRT73LC00

E3/DS3/STS-1 LINE INTERFACE UNIT

PRELIMINARY

REV. P1.0.1

SDI/

(LOSMUTEN)

Serial Data Input for the Microprocessor Serial Interface (HOST Mode) or

MUTE-upon-LOS Enable Input (Hardware Mode):

The function of this input pin depends upon whether the XRT73LC00 is operat-

ing in the HOST or the Hardware Mode.

Serial Data Input for the Microprocessor Serial Interface (HOST Mode):

This pin is used to read or write data into the Command Registers of the Micro-

processor Serial Interface. The Read/Write bit, the Address Values of the Com-

mand Registers and Data Value to be written during Write Operations are

applied to this pin.

This input is sampled on the rising edge of the SCLK pin (pin 21).

MUTE-upon-LOS Enable Input (Hardware Mode):

In the Hardware Mode this input pin is used to configure the XRT73LC00 to Mute

the recovered data via the RPOS and RNEG output pins whenever it declares an

LOS condition.

Setting this input pin “High” configures the XRT73LC00 to automatically pull the

RPOS and RNEG output pins to GND whenever it is declaring an LOS condition,

thereby Muting the data being output to the Terminal Equipment.

Setting this input pin “Low” configures the XRT73LC00 to NOT automatically

Mute the recovered data whenever an LOS condition is declared.

SDO/(LCV)

Serial Data Output from the Controller Port/(Line Code Violation Output

(LCV) Indicator.):

The function of this input pin depends upon whether the XRT73LC00 is operat-

ing in the HOST or the Hardware Mode.

HOST Mode - Microprocessor Serial Interface - Serial Data Output.

This pin serially outputs the contents of the specified Command Register during

Read Operations. The data on this pin is updated on the falling edge of the

SCLK input signal. This pin is tri-stated upon completion of data transfer.

Hardware Mode - Line Code Violation Output Indicator.

This pin pulses “High” for one bit period any time the Receive Section of the

XRT73LC00 detects a Line Code Violation in the incoming E3, DS3 or STS-1

Data Stream.

SCLK/

(ENDECDIS)

Microprocessor Serial Interface Clock Signal/Encoder Disable:

HOST Mode - Microprocessor Serial Interface Clock Signal

This signal is used to sample the data on the SDI pin on the rising edge of this

signal. During Read operations, the Microprocessor Serial Interface updates the

SDO output on the falling edge of this signal.

Hardware Mode - B3ZS/HDB3 Encoder/Decoder Disable

Setting this input pin “High” disables both the B3ZS/HDB3 Encoder and

Decoder. This setting configures the Transmit Section of the XRT73LC00 to

transmit data to the remote terminal equipment via the AMI Line Code. This set-

ting also configures the Receive Section to receive a line signal via the AMI Line

Code.

Setting this input pin “Low” enables both the B3ZS/HDB3 Encoder and Decoder.

This setting configures the Transmit Section of the XRT73LC00 to transmit data

in the B3ZS format for DS3/STS-1 applications or the HDB3 format for E3 appli-

cations. This setting configures the Receive Section to receive a line signal that

has been encoded into the B3ZS or HDB3 line code.

PIN DESCRIPTION

PIN #SYMBOL

TYPE

DESCRIPTION

XRT73LC00 Datasheet(PDF) 9 Page - Exar Corporation

XRT73LC00 Datasheet(HTML) 9 Page - Exar Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

Datasheet Download

Link URL