XRT73LC00 datasheet(39/53 Pages) EXAR

39 / 53 page

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XRT73LC00

E3/DS3/STS-1 LINE INTERFACE UNIT

PRELIMINARY

REV. P1.0.1

To enable this feature, access the Microprocessor Se-

rial Interface and write a “1” into the LOSMUT bit-field

in Command Register 3.

NOTE: The XRT73LC00 automatically declares an LOS

Condition any time it has been configured to operate in

either the Analog Local Loop-Back or Digital Local Loop-

Back Modes. Muting -upon -LOS must be disabled prior to

configuring the device to operate in either of these local

Loop-Back modes.

3.7

ROUTING THE RECOVERED TIMING AND DATA

INFORMATION TO THE RECEIVING TERMINAL

EQUIPMENT

The XRT73LC00 ultimately takes the Recovered Tim-

ing and Data information, converts it into CMOS lev-

els and routes it to the Receiving Terminal Equipment

via the RPOS, RNEG, RCLK1 and RCLK2 output

pins.

The XRT73LC00 can deliver the recovered data and

clock information to the Receiving Terminal in either a

Single-Rail or Dual-Rail format.

Routing Dual-Rail Format Data to the Receiving

Terminal Equipment

Whenever the XRT73LC00 delivers Dual-Rail format

to the Terminal Equipment it does so via the following

output signals.

• RPOS

• RNEG

• RCLK1

• RCLK2

Figure 24 illustrates the typical interface for the trans-

mission of data in a Dual-Rail Format from the Re-

ceive Section of the XRT73LC00 to the Receiving

Terminal Equipment.

The manner that the LIU transmits Dual-Rail data to

the Receiving Terminal Equipment is described below

and illustrated in Figure 25. The XRT73LC00 typical-

ly updates the data on the RPOS and RNEG output

pins on the rising edge RCLK1 (or RCLK2).

COMMAND REGISTER CR3 (ADDRESS = 0X03)

RNRZ

LOSMUT

CLK2DIS RCLK2INV CLK1INV

XXX

FIGURE 24. THE TYPICAL INTERFACE FOR THE TRANSMISSION OF DATA IN A DUAL-RAIL FORMAT FROM THE

RECEIVE SECTION OF THE XRT73LC00 TO THE RECEIVING TERMINAL EQUIPMENT

Exar E3/DS3/STS-1 LIU

Receive

Logic

Block

RxPOS

RxNEG

RCLK1, 2

RPOS

RNEG

RCLK1, 2

Terminal

Equipment

(E3/DS3 or STS-1

Framer)

XRT73LC00 Datasheet(PDF) 39 Page - Exar Corporation

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