741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

The VSC7281 is a Dual XAUI – Single

XGMII Transceiver tailored for 10 Gigabit

Ethernet (10GbE) and 10 Gigabit Fibre

Channel (10GFC) applications. The feature

set and flexibility of these devices make

them perfectly suited for Backplane and

other Serial Interconnect applications such as Serial Rapid

I/O, PCI Express and XAUI.

With four channels of serial transmitter/receiver pairs, these

transceivers can deliver a duplex data rate of greater than 20

Gbps. These serial channels can be configured for independent

operation, or as fully 10GbE/10GFC compliant XAUI (10 Gigabit

Attachment Unit Interface) serial buses. The parallel bus is fully

XGMII (10 Gigabit Media Independent Interface) compliant. When

independent channel operation is required, the parallel bus can

be configured for either 8- or 10-bit operation with the ability to

enable or bypass the internal 8B/10B encoders/decoders.

No additional external logic is required for the basic operation of

this device. However, for flexibility and systems adaptability, an

MDIO (Management Data Input/Output) interface is provided for

internal register access. These registers are MDIO compliant and

allow for monitoring and configuration of special modes for

diagnostics, BIST (Built-In-Self Test), and various control of

special channel features, such as pre-emphasis, cable

equalization, reduced output swing, loopback, signal detection

and XAUI port selection.

The flexibility of this device is not only seen in the MDIO register

programmable feature set, but also in a wide range of supported

frequencies. With a serial data rate that can range from 0.95

Gbps to 3.25 Gbps, this device supports multiple communication

applications such as Fibre Channel, InfiniBand, and Ethernet. The

VSC7281 has the functionality to support these common rates

simultaneous with a single external reference clock.

Whether the application is a high-speed backplane, chassis-to-

chassis communication or an optical link, these devices can

provide the flexibility and reliability required in today’s high-end

Data Communication systems.

GENERAL DESCRIPTION:

Dual XAUI – Single XGMII Quad 0.95 Gbps to 3.25 Gbps Transceiver

VSC7281

2GFC and 1GFC Simultaneous Operation

APPLICA TIONS:

MODES OF OPERA TION:

The VSC7281 allow for flexibility in multiple systems

environments.

• Single Port XGMII-Dual XAUI

- Supervisor and Redundant XAUI

- Link Ready State Diagnostics

XAUI-B

XAUI-A

XGMII

XAUI

Retimer

•

-Through

Retimer/Switch

•

-up

XAUI-B

XAUI-A

XAUI

Retimer

XAUI Loop

XAUI

XGMII Bypass

Supervisor

High Speed Signal Clean

-

-

-

XGMII

10 Gigabit Ethernet Port Application

• Driving out-of-box optics or backplane

XENPAK

Optical Module

Backplane

Interconnect

10GE MAC(s),

10GE Switch,

and/or

Switch Fabric(s)

XGMII

XAUI-B

XAUI-A

VSC7281

SerDes

Transceiver

XENPAK

Optical Module

Backplane

Interconnect

10GE MAC(s),

10GE Switch,

and/or

Switch Fabric(s)

2x2.125 Gbps

2-lane FC

2-lane FC

2x1.06 Gbps

2x2.125G

2x1.06G

Vitesse, ASIC-Friendly, FibreTimer, TimeStream and Snoop Loop are trademarks of Vitesse Semiconductor Corporation.

All other trademarks or registered trademarks mentioned herein are the property of their respective holders. Vitesse

Semiconductor Corporation ("Vitesse") retains the right to make changes to its products or specifications to improve

performance, reliability or manufacturability. All information in this document, including descriptions of features,

functions, performance, technical specifications and availability, is subject to change without notice at any time.

For more information on Vitesse Products visit the Vitesse web site

at www.vitesse.com or contact Vitesse Sales at (800) VITESSE

or sales@vitesse.com