Apple 17-INCH manual Ethernet Port, Booting from a FireWire Device, Target Disk Mode

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CHAPTER 3

Devices and Ports

Booting from a FireWire Device

The PowerBook G4 17-inch computer can boot from a FireWire storage device that implements SBP-2 (Serial Bus Protocol) with the RBC (reduced block commands) command set. Detailed information is available from Developer Technical Support at dts@apple.com.

Target Disk Mode

One option at boot time is to put the computer into a mode of operation called target disk mode.

When the PowerBook G4 17-inch computer is in target disk mode and connected to another Macintosh computer by a FireWire cable, the PowerBook G4 17-inch computer operates like a FireWire mass storage device with the SBP-2 (Serial Bus Protocol) standard. Target disk mode has two primary uses:

●high-speed data transfer between computers

●diagnosis and repair of a corrupted internal hard drive

The PowerBook G4 17-inch computer can operate in target disk mode as long as the other computer has a FireWire 1394a or 1394b port and is running either Mac OS X (any version) or Mac OS 9 with FireWire software version 2.3.3 or later.

To put the computer into target disk mode, hold down the T key while the computer is starting up. When Open Firmware detects the T key during the boot process, it transfers control to special Open Firmware code.

To take the computer out of target disk mode, press the power button.

When running target disk mode from a PowerBook G4 17-inch computer using a 45 W adapter, the screen dims and the battery icon displays the battery level, giving the appearance of operating on battery power.

Ethernet Port

The PowerBook G4 17-inch computer has a built-in Ethernet port that supports 10Base-T, 100Base-T, and 1000Base-T transfer rates. In operation, the actual speed of the link is auto-negotiated between the computer’s PHY device and the network bridge or router to which it is connected.

The connector for the Ethernet port is an RJ-45 connector on the right side of the computer. Table 3-4(page

29)shows the signals and pin assignments for 10Base-T and 100Base-T operation. Table 3-5(page 30) shows the signals and pin assignments for 1000Base-T operation.

Table 3-4		Signals for 10Base-T and 100Base-T operation
Pin	Signal name		Signal definition
1	TXP		Transmit (positive lead)
2	TXN		Transmit (negative lead)
3	RXP		Receive (positive lead)
Ethernet Port			29

Legacy Document 2003-03-01 © 2003 Apple Computer, Inc. All Rights Reserved.

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Contents 2003-03-01 PowerBook G4 17-inchApple Inc Contents Expansion Features Abbreviations Contents Figures and Tables Removing RAM expansion slot cover Organization of This Document Introduction to PowerBook G4 17-inchIntroduction PowerBook G4 17-inch Features Overview of PowerBook G4 17-inchAppearance 1Front view of the computer System Software Peripheral DevicesOpen Firmware Computer IdentificationOperating Modes Power Saving FeaturesReduced Processor Performance Overview of PowerBook G4 17-inch System Software Block Diagram Block Diagram and BusesMain ICs and Buses PowerPC G4 MicroprocessorMicroprocessor and Caches Level 2 Cache Intrepid Controller and BusesLevel 3 Cache Bus Destinations Width of data pathFireWire Controllers Boot ROMSystem RAM Ethernet ControllerDMA Support ControllerUSB Interface Interrupt SupportUltra ATA-100 Interface ATA-33 InterfaceAirPort Extreme Interface Power ControllerSound Circuitry CardBus Controller IC Pin Signal name USB ConnectorsUSB Ports VCC USB Storage Devices FireWire Ports FireWire 400 Connector Pin Signal name Description FireWire 800 ConnectorTPB R TPA RTarget Disk Mode Booting from a FireWire DevicePin Signal name Signal definition Ethernet PortRXN Internal ModemData Security AirPort ExtremeAirPort Extreme Software Bluetooth TechnologyAirPort Extreme Hardware Hard Disk Drive Hard Disk Dimensions4Maximum dimensions of the internal hard disk Hard Disk ConnectorPin number Signal name Signal AssignmentsSignal name Signal description ATA Signal DescriptionsMedia type Reading speed maximum Writing speed SuperDrive DVD-R /CD-RWMedia type Reading speed maximum TrackpadKeyboard Keyboard Illustrations Changing the Operation of the Keyboard7Alternate operations of function and control keys Keyboard 8Embedded numeric keypad operation Keyboard Using the Num Lock Key Using the Fn KeyFunction Keys Key name Control buttonOther Control Keys Embedded KeypadKey name Control button F10 Keypad functionBlack margins Flat-Panel DisplayPicture size Analog Monitor Resolutions Dual Display and Mirror ModeExternal Monitors Frame rateDVI-I Connector Digital Display Resolutions15Main signals on the DVI-I connector Picture size Pixel depth 512 by 24 bpp Pin number Video output connectorExternal Video Port Sound Inputs Sound SystemSound Outputs Modem Activity Sound SignalsBuilt-in Microphone Audio Input JackInternal Speakers Digitizing SoundDevices and Ports Sound System RAM Expansion Slots Accessing the RAM SlotsElectrical Design of DDR RAM SO-DIMMs Mechanical Design of DDR RAM SO-DIMMsDDR Sdram Devices Configuration of DDR RAM SO-DIMMsDevice size RAM SO-DIMM Electrical LimitsAddress Multiplexing CardBus Slot Expansion Features CardBus Slot 3D Graphics PowerPC G4 MicroprocessorApple Technical Notes Mac OS Velocity Engine AltiVecKit Open FirmwarePC Card Manager RAM Expansion ModulesUSB Interface FireWire InterfaceATA Devices Digital Visual Interface Wireless NetworksBluetooth Supplemental Reference Documents Bluetooth Other Abbreviations Abbreviations and Standard UnitsATA AsicCAS CD-ROMJedec ISOLED MDISPD SO-DIMMTmds USB