LXT300Z datasheet(7/20 Pages) LVL1

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The transceiver incorporates an advanced Driver Perfor-

mance Monitor (DPM) in parallel with the TTIP and

TRING at the output transformer. The DPM circuitry uses

four comparators and a 150 ns pulse discriminator to filter

glitches. The DPM output level goes high upon detection of

63 consecutive zeros, and is cleared when a one is detected

on the transmit line, or when a reset command is received.

The DPM output also goes High to indicate a ground on

TTIP or TRING. A ground fault induced DPM flag is auto-

matically cleared when the ground condition is corrected

(chip reset is not required).

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The LXT300Z and LXT301Z transceivers can be con-

trolled through hard-wired pins (Hardware Mode). Both

transceivers can also be commanded to operate in one of

several diagnostic modes.

LXT300Z Only:

The LXT300Z can be controlled by a

microprocessor through a serial interface (Host Mode).

The mode of operation is set by the MODE pin logic level.

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In Hardware Mode the transceiver is accessed and con-

trolled through individual pins. With the exception of the

INT and CLKE functions, Hardware Mode provides all the

functions provided in the Host Mode. In the Hardware

Mode RPOS and RNEG outputs are valid on the rising

edge of RCLK.

The LXT301Z operates in Hardware

Mode at all times.

LXT300Z Only: To operate in Hardware Mode, MODE

must be set Low. Equalizer Control signals (EC1 through

EC3) are input on the Interrupt, Serial Data In and Serial

Data Out pins. Diagnostic control for Remote Loopback

(RLOOP), Local Loopback (LLOOP), and Transmit All

Ones (TAOS) modes is provided through the individual pins

used to control serial interface timing in the Host Mode.

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