TMC2005 datasheet(8/32 Pages) SMSC

8 / 32 page

SMSC DS – TMC2005

Page 8

Rev. 10/24/2000

TX/RX Interface

FEATURE

NAME

INPUT/OUTPUT

DESCRIPTION

RX Port

RXINA [0:1]

RXINB [0:1]

EXTRX

INPUT

Setup the polarity by SA, SB, SE.

RX Port

Polar

Assignment

SA, SB, SE

INPUT

Setup the polarity of RXINA [0:1],

RXINB [0:1], EXTTX.

0 : active H

1: active L

TX Port

TX Control

TXENA [0:1]

TXENB [0:1]

EXTTX

OUTPUT

TX data pulse (Mx=0) or TX

enable signal (Mx=1).

Setup TX mode by MA, MB, ME.

Setup the polarity by LA, LB, LE

TX Port

TX Data

Output

nPULSE [1:2]

OUTPUT

TX pulse data into HYC9068S-

SK/9088S-SK when ARCNET

chip is at normal mode.

The pulse is always active Low.

TX Port

nP1BAK

OUTPUT

TX pulse data into RS485 driver

or HYC2485S/2488S when

ARCNET chip is at backplane

mode.

The pulse is always active Low.

TX Port

Polarity

Setup

LA, LB, LE

INPUT

Setup the polarity of TXENA [0:1],

TXENB [0:1], EXTTX.

0 : active L

1: active H

TX Port

Mode Setup

MA, MB, ME

INPUT

Setup the mode of TXENA [0:1],

TXENB [0:1], EXTTX.

0: Output TX pulse. (It is

equivalent to nTXEN “OR”

nP1BAK)

1: Output TX enable

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