XRT73LC00A Datasheet, PDF(39/53 Page) Exar Corporation

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XRT73LC00A Datasheet, PDF (39/53 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT

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PRELIMINARY

XRT73LC00A

E3/DS3/STS-1 LINE INTERFACE UNIT

REV. P1.0.0

To enable this feature, access the Microprocessor Se-

rial Interface and write a â1â into the LOSMUT bit-field

in Command Register 3.

COMMAND REGISTER CR3 (ADDRESS = 0X03)

RNRZ LOSMUT CLK2DIS RCLK2INV CLK1INV

NOTE: The XRT73LC00A 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 XRT73LC00A ultimately takes the Recovered

Timing and Data information, converts it into CMOS

levels and routes it to the Receiving Terminal Equip-

ment via the RPOS, RNEG, RCLK1 and RCLK2 out-

put pins.

The XRT73LC00A 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 XRT73LC00A delivers Dual-Rail for-

mat to the Terminal Equipment it does so via the fol-

lowing output signals.

â¢ RPOS

â¢ RNEG

â¢ RCLK1

â¢ 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 XRT73LC00A to the Receiving

Terminal Equipment.

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

RECEIVE SECTION OF THE XRT73LC00A TO THE RECEIVING TERMINAL EQUIPMENT

Terminal

Equipment

(E3/DS3 or STS-1

Framer)

RxPOS

RxNEG

RCLK1, 2

RPOS

RNEG

Receive

Logic

RCLK1, 2 Block

Exar E3/DS3/STS-1 LIU

The manner that the LIU transmits Dual-Rail data to

the Receiving Terminal Equipment is described below

and illustrated in Figure 25. The XRT73LC00A typi-

cally updates the data on the RPOS and RNEG out-

put pins on the rising edge RCLK1 (or RCLK2).

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