IEEE-1394 Data Link

Design ReviewSherry Womack

Erik Pace

ECE 4040

Dr. Martin Brooke

Overall View of Project

Introduction

• What is IEEE-1394?

– FireWire– IEEE 1394-1995 Standard for a High

Performance Serial Bus.– A standard for high-speed data communication

between multimedia products.

Advantages of 1394

• Versatility– Can link up to 63 devices without additional hardware.

• High speed– 100 Mbps, 200 Mbps, 400 Mbps, or 1.2 Gbps.

• Low cost– Cost of implementation less than technology replaced.

• Ease of installation and use– Extends Plug and Play features beyond confines of PC.

What protocols does 1394 define?

• Physical– Bits on a wire

– Arbitration

– Reset and bus configuration

• Link– Packets on the wire

• Transaction– Read, write, lock, etc.

• Bus Management

1394 Protocol Stack and Serial Bus Management Controller

Physical Layer Chip

• TSB41LV03A IEEE 1394a Three-Port Cable Transceiver/Arbiter.

• Provides digital and analog transceiver functions needed to implement a 1394 network.

• Includes circuitry to monitor line conditions, for initialization and arbitration, and for packet reception and transmission.

Link Layer Chip

• TSB12LV42 (DVLynx) IEEE 1394-1995 Link Layer Controller for Digital Video.

• 1394 interface for high speed audio, video, and data applications.

• Provides a bulky data interface that supports long term data rates up to 60 Mbps.

Physical and Link Layer Connections

Cable Connections and Power Decoupling Network

Components

Vendors

• DigiKey

• Linear Technology

• Mouser

• National Semiconductor

• ON Semiconductor

• Texas Instruments

PCB Layout

Design Rules for PCB Layout• Minimize the length

of the etches between the physical layer and the cable connector

• Minimize the length of the etches between the physical and link layers

Design Rules for PCB Layout

• Keep the cable signal lines the same length

• Add power decoupling networks as close as possible to power pins

Design Rules for PCB Layout

• Place the power regulator away from the twisted pair edges, the clock crystal and the physical layer

Regulator

Physical Layer

Twisted pair edges

Clock crystal

Backplane Layout

Unresolved Issues

• Initialization state

• Processing link layer data

• Format of camera data– Asynchronous– Isochronous

Upcoming Milestones

• Board fabrication

• Testing

• Determination of initialization state

• Transmission of data