LXT332PE Ver la hoja de datos (PDF) - LevelOne

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LXT332PE

Dual T1/E1 Line Interface Unit with Crystal-less Attenuation

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ECE0 DI Encoder Enable - Port 0. In the Unipolar mode, a High on this pin enables

the B8ZS or HDB3 encoder and decoder for port 0.

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BPV0 DO Bipolar Violation - Port 0. In the Unipolar mode this indicator output goes

High when a bipolar violation is received at port 0.

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RDATA0 DO Receive Data - Port 0. In the Unipolar mode, RDATA is a Non-Return-to-

Zero (NRZ) output. CLKE determines the RCLK edge which RDATA is

stable and valid.

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RDATA1 DO Receive Data - Port 1. In the Unipolar mode, RDATA is a Non-Return-to-

Zero (NRZ) output. CLKE determines the RCLK edge which RDATA is

stable and valid.

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BPV1 DO Bipolar Violation - Port 1. In the Unipolar mode this indicator output goes

High when a bipolar violation is received at port 1.

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ECE1 DI Encoder Enable - Port 1. In the Unipolar mode, a High on this pin enables

the B8ZS or HDB3 encoder and decoder for port 1.

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TDATA1 DI Transmit Data - Port 1. In the Unipolar mode, the data to be transmitted

onto the twisted-pair line from port 1 is input at this pin.

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TRSTE DI Tristate Output Enable Input Pin. Forces all output pins to high-Z Tri-state

when held High. Enables Bipolar I/O mode when held Low. In this mode the

framer interface is bipolar (TPOS/TNEG and RPOS/RNEG), and the B8ZS/

HDB3 encoders are disabled. Enables Unipolar I/O mode when clocked by

MCLK. In this mode the framer interface is unipolar (TDATA and RDATA),

and the TNEG and RNEG pins are re-mapped. The TNEG pins are re-mapped

as Encoder Enable (ECE) to individually enable the B8ZS/HDB3 encoder/

decoder for each port. The RNEG pins are re-mapped as Bipolar Violation

(BPV) indicators to report BPVs received at the respective ports.

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TCLK0 DI Transmit Clock - Port 0. 1.544 MHz for T1, 2.048 MHz for E1. The trans-

mit data inputs are sampled on the falling edge of TCLK.

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TPOS0 DI Transmit Data Positive and Negative - Port 0. In the Bipolar I/O mode,

(Bipolar)

these pins are the positive and negative sides of a bipolar input pair for port 0.

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TNEG0

Data to be transmitted onto the twp line is input at these pins. However, when

TRSTE is clocked by MCLK, the LXT332 switches to a unipolar mode. Uni-

(Bipolar)

polar mode pin functions are described separately.

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RNEG0 DO Receive Data Positive and Negative - Port 0. In the Bipolar I/O mode, a sig-

(Bipolar)

nal on RNEG corresponds to receipt of a negative pulse on RTIP/RRING. A

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RPOS0

signal on RPOS corresponds to receipt of a positive pulse on RTIP/RRING.

RNEG/RPOS outputs are Non-Return-to-Zero (NRZ). RPOS and RNEG are

(Bipolar)

stable and valid on the rising edge of RCLK.

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