SMSC TMC2005-JT PLL, NAME, NAME, NAME, INPUT, INPUT, OUTPUT, OUTPUT, FEATURE, FEATURE, FEATURE, DESCRIPTION, DESCRIPTION, DESCRIPTION, INPUT/OUTPUT, Operating Mode Setup

ARCNET 5 Port HUB Controller

Datasheet

FEATURE

NAME

INPUT/OUTPUT

DESCRIPTION

mode.

The pulse is always active Low.

TX Port

Polarity

LA, LB, LE

INPUT

Setup the polarity of TXENA

Setup

[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

INPUT/

FEATURE

NAME

OUTPUT

DESCRIPTION

Data rate

CKM [0:2]

INPUT

Terminal to setup the data rate of TMC2005.

setup

CKM2 CKM1 CKM0 DIVISOR MULTIPLIER

SPEED

0

0

0

16

x1

156.25 Kbps

0

0

1

8

x1

312.5 Kbps

0

1

0

4

x1

625 Kbps

0

1

1

2

x1

1.25 Mbps

1

0

0

1

x1

2.5 Mbps

1

0

1

1

x2

5 Mbps

1

1

0

Reserved

Reserved

Reserved

1

1

1

1

x4

10 Mbps

External clock is 20MHz.

Refer to “VARIOUS SETUP”

Noise cut

nMBA

INPUT

0: Cut off noise from received data

mode

nMBB

1: Don’t cut off noise

nMBE

Setup “0” normally.

Big jitter

nBJA

INPUT

Setup a jitter filter feature.

mode

nBJB

Select a pulse as reference phase used by DPLL.

nBJE

0: 2nd pulse (big jitter mode)

1: 1st pulse (normal mode)

Open drain

nEXTOD

INPUT

Setup a the use of EXTTX port.

mode

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

1: Set EXTTX as normal output and use as 5th port.

PLL

INPUT/

FEATURE

NAME

OUTPUT

DESCRIPTION

LP

OUTPUT

Using PLL: Connect to an external condenser

“C1” for loop filter.

Using no PLL: must be open.

RO

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.

Revision 1.1 (07-24-07)

Page 8

SMSC TMC2005-JT

DATASHEET