XRT73LC00A_08 Datasheet, PDF(59/63 Page) Exar Corporation

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XRT73LC00A_08 Datasheet, PDF (59/63 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT

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XRT73LC00A

E3/DS3/STS-1 LINE INTERFACE UNIT

REV. 1.0.1

This Read/Write bit-field is used to configure the Receiver in the XRT73LC00A to output the recovered data on

either the rising edge or the falling edge of the RCLK2 clock signal.

Writing a â0â to this bit-field configures the Receiver to output the recovered data on the rising edge of the

RCLK2 output signal. Writing a â1â to this bit-field configures the Receiver to output the recovered data on the

falling edge of the RCLK2 output signal.

Bit D0 - RCLK1INV (Invert RCLK1)

This Read/Write bit-field is used to configure the Receiver in the XRT73LC00A to output the recovered data on

either the rising edge or the falling edge of the RCLK1 clock signal.

Writing a â0â to this bit-field configures the Receiver to output the recovered data on the rising edge of the

RCLK1 output signal. Writing a â1â to this bit-field configures the Receiver to output the recovered data on the

falling edge of the RCLK1 output signal.

5.1.5 Command Register - CR4

Bit D4 - Reserved

This bit-field has no defined functionality

Bit D3 - STS-1/DS3 Mode Select

This Read/Write bit-field is used to configure the XRT73LC00A to operate in either the SONET STS-1 Mode or

the DS3 Mode.

Writing a â0â into this bit-field configures the XRT73LC00A to operate in the DS3 Mode. Writing a â1â into this

bit-field configures the XRT73LC00A to operate in the SONET STS-1 Mode.

NOTE: This bit-field is ignored if the E3 bit-field (D2 in this Command Register) is set to â1â.

Bit D2 - E3 Mode Select

This Read/Write bit-field is used to configure the XRT73LC00A to operate in the E3 Mode.

Writing a â0â into this bit-field configures the XRT73LC00A to operate in either the DS3 or SONET STS-1 Mode

specified by the setting of the DS3 bit-field in this Command Register. Writing a â1â into this bit-field configures

the XRT73LC00A to operate in the E3 Mode.

Bit D1 - LLB (Local Loop-Back)

This Read/Write bit-field along with RLB (bit D0 in this Command Register) is used to select which Loop-Back

mode the XRT73LC00A operates in. Table 6 relates the state of the LLB and RLB to the selected Loop-Back

mode.

Bit D0 - RLB (Remote Loop-Back)

This Read/Write bit-field along with LLB (bit D1 in this Command Register) is used to select which Loop-Back

mode the XRT73LC00A operate in. Table 6 relates the state of the LLB and RLB bits to the selected Loop-

Back mode.

TABLE 6: LOOP-BACK MODES

LLB

RLB

(BIT D1) (BIT D0)

LOOP-BACK MODE

No Loop-Back Mode (Normal

Operation)

Remote Loop-Back Mode

Analog Loop-Back Mode

Digital Loop-Back Mode

5.2 Operating the Microprocessor Serial Interface.

The XRT73LC00A Serial Interface is a simple four wire interface that is compatible with many of the

microcontrollers available in the market. This interface consists of the following signals:

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