LXT386LE datasheet(11/78 Pages) INTEL

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QUAD T1/E1/J1 Transceiver — LXT386

Datasheet

Table 1.

Pin Assignments and Signal Descriptions

Ball #

PBGA

Pin #

LQFP

Symbol

I/O1

Description

MCLK

Master Clock. MCLK is an independent, free-running reference clock. It’s

frequency should be 1.544 MHz for T1 operation and 2.048 MHz for E1

operation.

This reference clock is used to generate several internal reference

signals:

•

Timing reference for the integrated clock recovery unit

•

Timing reference for the integrated digital jitter attenuator

•

Generation of RCLK signal during a loss of signal condition

•

Reference clock during a blue alarm transmit all ones condition

•

Reference timing for the parallel processor wait state generation logic

If MCLK is High, the PLL clock recovery circuit is disabled. In this mode,

the LXT386 operates as simple data receiver.

If MCLK is Low, the complete receive path is powered down and the

output pins RCLK, RPOS and RNEG are switched to Tri-state mode.

MCLK is not required if LXT386 is used as a simple analog front-end

without clock recovery and jitter attenuation.

Note that wait state generation via RDY/ACK is not available if MCLK is

not provided.

MODE

Mode Select. This pin is used to select the operating mode of the

LXT386. In Hardware Mode, the parallel processor interface is disabled

and hardwired pins are used to control configuration and report status.

In Parallel Host Mode, the parallel port interface pins are used to control

configuration and report status.

In Serial Host Mode the serial interface pins: SDI, SDO, SCLK and CS are

used.

For Serial Host Mode, the pin should connected to a resistive divider

consisting of two 10 k

Ω resistors across VCC and Ground.

Address Select. In host mode, this pin is Address 4 input pin. In hardware

mode this pin must be connected to Ground.

1. DI: Digital Input; DO: Digital Output; DI/O: Digital Bidirectional Port; AI: Analog Input; AO: Analog Output S: Power Supply;

N.C.: Not Connected.

2. N/C means “Not Connected”

MODE

Operating Mode

Hardware Mode

Parallel Host Mode

Vcc/2

Serial Host Mode

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