VT6103 datasheet(12/46 Pages) VIA

12 / 46 page

VT6103 - Fast Ethernet 10 / 100 PHY / Transceiver

Revision 1.1, April 15, 2002

-6-

Pin Descriptions

Technologies, Inc.

We Connect

Resets, Clocks, Control and Status

Signal Name

Pin #

I/O

Signal Description

Crystal In. Connect to 25 MHz crystal and to 22pF 5% to GNDOSC. Can alternately be

driven by an external clock source (3.3V voltage swing) with XO unconnected.

Crystal Feedback. Connect to other side of 25 MHz crystal and to 22pF 5% to GNDOSC

BYPOSC / RXDV

Bypass Oscillator. Connect to pullup to use an external oscillator instead of a crystal.

REXT

External Resistor. Connect 6.49K 1% resistor to GNDOSC.

SD /FXEN

Signal Detect. Used in fiber mode.

PD#

Power Down. Active low.

RESET#

Reset. Active low. Schmitt input for improved noise immunity..

Power and Ground

Signal Name

Pin #

I/O

Signal Description

VDD

7, 24

Digital I/O Power. 3.3V nominal (3.15V to 3.45V). For digital I/O

GND

8, 23

Ground. Connect to primary motherboard ground plane.

VCC

Core Power. 3.3V nominal (3.15V to 3.45V). For internal digital logic.

GND

Core Ground. Connect to primary motherboard ground plane.

VCCOSC

Oscillator Power. 3.3V. Isolate from digital supply voltage with a ferrite bead

GNDOSC

Oscillator Ground. Connect to primary motherboard ground plane.

VCCRX

Receiver Power. 3.3V. Isolate from digital supply voltage with a ferrite bead

GNDRX

Receiver Ground. Connect to primary motherboard ground plane.

VCCTX

Transmitter Power. 3.3V. Isolate from digital supply voltage with a ferrite bead

GNDTX

Transmitter Ground. Connect to primary motherboard ground plane.

GNDTXC

Transmit Clock Ground. Connect to primary motherboard ground plane.

VCCPLL

PLL Power. 3.3V. Isolate from digital supply voltage with a ferrite bead

GNDPLL

PLL Ground. Connect to primary motherboard ground plane.

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