TMC2005 datasheet(8/32 Pages) SMSC

8 / 32 page

ARCNET 5 Port HUB Controller

Datasheet

Revision 1.0 (01-30-06)

Page 8

SMSC TMC2005-JT

DATASHEET

FEATURE

NAME

INPUT/OUTPUT

DESCRIPTION

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

Operating Mode Setup

FEATURE

NAME

INPUT/

OUTPUT

DESCRIPTION

Data rate

setup

CKM [0:2]

INPUT

Terminal to setup the data rate of TMC2005.

CKM2 CKM1 CKM0 DIVISOR MULTIPLIER

SPEED

156.25 Kbps

312.5 Kbps

625 Kbps

1.25 Mbps

2.5 Mbps

5 Mbps

0 Reserved Reserved

Reserved

10 Mbps

External clock is 20MHz.

Refer to “VARIOUS SETUP”

Noise cut

mode

nMBA

nMBB

nMBE

INPUT

0: Cut off noise from received data

1: Don’t cut off noise

Setup “0” normally.

Big jitter

mode

nBJA

nBJB

nBJE

INPUT

Setup a jitter filter feature.

Select a pulse as reference phase used by DPLL.

0: 2

nd pulse (big jitter mode)

1: 1

st pulse (normal mode)

Open drain

mode

nEXTOD

INPUT

Setup a the use of EXTTX port.

0: Set EXTTX as open drain output and use as Ext.

1: Set EXTTX as normal output and use as 5

th port.

PLL

FEATURE

NAME

INPUT/

OUTPUT

DESCRIPTION

OUTPUT

Using PLL: Connect to an external condenser

“C1” for loop filter.

Using no PLL: must be open.

OUTPUT

VCO output

Using PLL: Connect to an external resistor “R0” for

loop filter.

Using no PLL: must be open.

AGS

INPUT

Analog sense input.

Using PLL: Connect to loop filter.

Using no PLL: Connect to ground.

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