LXT386LE datasheet(13/78 Pages) INTEL

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QUAD T1/E1/J1 Transceiver — LXT386

Datasheet

D0/LOOP0

D1/LOOP1

D2/LOOP2

D3/LOOP3

D4/DLOOP0

D5/DLOOP1

D6/DLOOP2

D7/DLOOP3

DI/O

Loopback Mode Select/Parallel Data bus.

Host Mode:

When a non-multiplexed microprocessor interface is selected, these pins

function as a bi-directional 8-bit data port.

When a multiplexed microprocessor interface is selected, these pins carry

both bi-directional 8-bit data and address inputs A0 -A7.

In serial Mode, D0-7 should be grounded.

Hardware Mode:

In hardware mode, the LXT386 works in normal operation if this pin is left

open (unconnected).

The LXT386 enters remote loopback mode if LOOP is Low. In this mode,

data on TPOS and TNEG is ignored and data received on RTIP and

RRING is looped around and retransmitted on TTIP and TRING. Note: in

data recovery mode, the pulse template cannot be guaranteed while in a

remote loopback.

The LXT386 enters analog local loopback mode if LOOP=1 and

DLOOP=0. In this mode, data received on RTIP and RRING is ignored

and data transmitted on TTIP and TRING is internally looped around and

routed back to the receive inputs.

The LXT386 enters digital local loopback if LOOP=1 and DLOOP=1. In

this mode, data received on TCLK/TPOS/TNEG is digitally looped back to

RCLK/RPOS/RNEG.

Note: Note: when these inputs are left open, they stay in a high

impedance state. Therefore, the layout design should not route

signals with fast transitions near the LOOP pins. This practice will

minimize capacitive coupling.

TCLK1

Transmit Clock.

TPOS1/

TDATA1

Transmit Positive Data.

Transmit Data.

TNEG1/

UBS1

Transmit Negative Data.

Unipolar/Bipolar Select.

RCLK1

Receive Clock.

RPOS1/

RDATA1

Receive Positive Data.

Receive Data.

RNEG1/

BPV1

Receive Negative Data.

Bipolar Violation Detect.

LOS1

Loss of Signal.

Table 1.

Pin Assignments and Signal Descriptions (Continued)

Ball #

PBGA

Pin #

LQFP

Symbol

I/O1

Description

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”

LOOP

DLOOP

Operating Mode

Open

Normal Mode

Remote Loopback

Analog Local Loopback

Digital Local Loopback

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