COM20020IP3V datasheet(20/72 Pages) SMSC

20 / 72 page

FIGURE 6 - DIPULSE WAVEFORM FOR DATA OF 1-1-0

In typical applications, the serial backplane is

terminated at both ends and a bias is provided by

the external pull-up resistor.

The RXIN signal is directly connected to the cable

via an internal Schmitt trigger. A negative pulse

on this input indicates a logic "1". Lack of pulse

indicates a logic "0".

For typical single-ended

backplane applications, RXIN is connected to

nPULSE1 to make the serial backplane data line.

A ground line (from the coax or twisted pair)

should run in parallel with the signal.

For

applications requiring different treatment of the

receive

signal

(like

filtering

squelching),

nPULSE1 and RXIN remain as independent pins.

External differential drivers/receivers for increased

range and common mode noise rejection, for

example,

would

require

the

signals

independent of one another.

When the device is in Backplane Mode, the clock

provided by the nPULSE2 signal may be used for

encoding the data into a different encoding

scheme or other synchronous operations needed

on the serial data stream.

Differential Driver Configuration

The Differential Driver Configuration is a special

case of the Backplane Mode. It is a dc coupled

configuration recommended for applications like

car-area

networks

other

cost-sensitive

applications

which

not

require

direct

compatibility with existing ARCNET nodes and do

not require isolation.

20MHZ

CLOCK

(FOR REF.

ONLY)

nPULSE1

nPULSE2

DIPULSE

RXIN

100ns

200ns

400ns

COM20020IP3V Folha de dados(PDF) 20 Page - SMSC Corporation

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