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Power Mac G5Developer Note(Legacy)

●SuperDrive (DVD+R DL/DVD+/-RW/CD-RW): The Power Mac G5 computer has a 16x SuperDrive connectedto the Ultra DMA ATA/100 bus. The SuperDrive supports

●Headphone and internal speaker: The front panel includes a headphone mini-jack and the system includesan internal front mono speaker. For more infor

Features of the EnclosureThe Power Mac G5 computer’s enclosure is a tower design. Figure 1-1 (page 12) illustrates the front of theenclosure and Figur

Figure 1-2 Power Mac G5 rear viewDoor latchAccess covers for PCIexpansion slotsDVI display portAirPort antenna portBluetooth antenna portPower socketO

Computer IdentificationRather than reading the box flag or the model string and then making assumptions about the computer’sfeatures, applications tha

In addition, the Power Mac G5 computer allows the user to control bus slewing mode. The options for specifyingeither high, reduced, or automatic proce

Velocity Engine AccelerationThe Velocity Engine is the vector processing unit in the PowerPC G5 microprocessor. System software has beenmodified to ta

This chapter describes the architecture of the Power Mac G5. It includes information about the major componentson the logic boards: the microprocessor

Figure 2-2 (page 19) is a simplified block diagram of the dual processor 2.3 and 2.7 GHz Power Mac G5. Thediagram shows the U3H and K2 ICs and the bus

Figure 2-2 block diagram for dual 2.3 and 2.7 GHz configurationsInternalspeaker1.5 GbpsSerial ATA bus10/100/1000Ethernet portOptical digital audio out

ContentsIntroduction to Power Mac G5 Developer Note 7Organization of This Document 7Overview to the Power Mac G5 8New Hardware Features 8Hardware Feat

●PCI-X bridge bus: some configurations support three 64-bit PCI-X slots: two 100 MHz and one 133 MHz ●Internal PCI bus: 33 MHz, 64-bit bus supports t

Bridge and Memory ControllerThe U3H custom IC is at the heart of the Power Mac G5 computer. It provides the bridging functionality amongthe processors

The AGP bus is an enhanced PCI bus with extra functionality to burst texture data and other graphics acrossthe port up to 8 times faster than a 66 MHz

In some configurations, the Power Mac G5 computer provides three PCI-X slots that interface to theHyperTransport bus via the PCI-X bridge. One slot ru

For more information on the HyperTransport technology, go to the World Wide Web athttp://www.hypertransport.orgPCI USB ControllerThe Power Mac G5 CPU

Wireless LAN ModuleThe AirPort Extreme Card wireless LAN module (via the PCI USB controller) contains a media access controller(MAC), a digital signal

FireWire ControllersThe K2 IC includes a FireWire controller that supports both IEEE 1394b (FireWire 800) with a maximum datarate of 800 Mbps (100 MBp

Sound System OverviewThe sound circuitry is connected to the K2 IC by a standard I2S (inter-IC sound) bus. The K2 IC provides DB-DMA(descriptor-based

For more detail on the audio, see Audio (page 46).Power ControllerThe power management controller in the Power Mac G5 computer is a microcontroller ca

Fan ControllerThe Power Mac G5 system employs advanced thermal and wattage management to keep acoustic noise to aminimum. The enclosure is divided int

Ultra DMA ATA/100 Interface 26Sound System Overview 27Power Controller 28Graphics Cards 28Fan Controller 29Liquid Cooling System 29Input and Output De

This chapter describes the Power Mac G5 computer’s built-in I/O devices and the ports for connecting externalI/O devices. Each of the following sectio

USB ConnectorsThe USB ports use USB Type A connectors, which have four pins each. Two of the pins are used for power andtwo for data. Figure 3-1 (page

FireWire PortsThe Power Mac G5 computer has one FireWire 800 port based on IEEE 1394b and two FireWire 400 IEEE 1394aports. Each FireWire port ●suppor

The 9-pin FireWire 800 connector is shown in Figure 3-2 (page 33). Its connector signals and pin assignmentsare shown in Table 3-2 (page 33).Figure 3-

The IEEE 1394b standard defines long-haul media using Cat 5 UTP and several kinds of optical fiber. The PowerMac G5 computer is interoperable with suc

The power pin provides up to 15 W total power, shared with the other FireWire connectors. The voltage onthe power pin is approximately 25 V.Pin 2 of t

For additional information about the FireWire interface and the Apple API for FireWire device control, see thereferences shown in FireWire Interface (

Note: When connecting a Power Mac G5 computer directly to another computer without using anEthernet hub, a crossover cable is not required; circuits

Signal definitionSignal namePinTransmit and receive data 3 (negative lead)TRD–(3)8To interconnect two computers for 1000Base-T operation, you must use

Table 3-6 Types of media read and written by the SuperDriveWriting speedReading speedMedia type16x ZONE, 8x, 4x, 2x, 1x (CLV) depending onmedia8x (CAV

Headphone Jack 50Video Monitor Ports 51DVI Connector 52Apple Display Connector 53DVI to Video Adapter 55Dual Display Extended and Mirror Modes 56Expan

Writing speedReading speedMedia type_8x max (CAV)DVD+/-R_4x max (CAV)DVD+R DL-8x (CAV max)DVD+/-RW32x (ZCLV)32x (CAV max)CD-R10x (CLV, for high speed

By communicating wirelessly with a base station, the AirPort Extreme Card can be used for Internet access,email access, and file exchange. A base stat

AirPort Extreme HardwareThe AirPort Extreme Card is a wireless LAN module compliant with the IEEE 802.11g standard using both OFDM(orthogonal frequenc

●Bluetooth file transfer profile (FTP) — enables browsing of the file system of other Bluetooth devices whichsupport Bluetooth FTP ●hardcopy cable re

Note: There is no power key on this keyboard.Keyboard LayoutThere are localized versions of the Apple Keyboard for use in different parts of the worl

Programmer’s SwitchesKey combinations for programmer’s switches that used the Power button on earlier models now use the Ejectkey. Here are the key co

% sudo nvram boot-args=""Note: The debug flags bit will be cleared if you use System Preferences to change the startup disk.It may also be

If audio data sampled from another computer at a lower rate is played as output on the Power Mac G5, theCore Audio (Mac OS X’s OS Level Audio API) tra

The Power Mac G5 computer also has the ability to lock its internal audio hardware to the incoming audiostream to synchronize the audio subsystem to a

Audio Line-inThe Power Mac G5 has a stereo audio line-in jack on the back panel. The audio inputs are designed to accepthigh-level audio signals: 2 Vr

Figures and TablesOverview to the Power Mac G5 8Figure 1-1 Power Mac G5 front view 12Figure 1-2 Power Mac G5 rear view 13Architecture 17Figure 2-1 blo

Note: For best results, headphones or other low-impedance devices should not be plugged intothe line-out jack. Such devices should be plugged into th

Note: For best results, equipment plugged into the headphone jack should not connect the audioground to other grounds, such as the chassis or "

DVI ConnectorThe supported graphics cards have either one or two DVI-I (DVI with analog) connectors. With a DVI to ADCadapter, available separately an

Signal namePinSignal namePinTMDS Data5–20Analog vertical sync8TMDS Data5+21TMDS Data1–9TMDS Clock Shield22TMDS Data1+10TMDS Clock+23TMDS Data1/3 Shiel

Table 3-10 Digital signals on the Apple display connectorSignal namePinSignal namePinTMDS Data1/3 Shield1625 V Supply1TMDS Data3–1725 V Supply2TMDS Da

The graphics data sent to the digital monitor use transition minimized differential signaling (TMDS). TMDSuses an encoding algorithm to convert bytes

S-video output connectorPin numberUnused6Unused7The Power Mac G5 computer provides video output at picture sizes and frame rates compatible with the N

This chapter describes the expansion features of the Power Mac G5 computer: the DDR SDRAM expansion slotsand the PCI or PCI-X expansion slots.Note: F

Additional DIMMs must be installed in the slots in pairs of the same size. The slot pairs are numbered asindicated in Figure 4-1 (page 58) and Figure

Figure 4-2 DIMM installation for dual 2.0 GHz processor configurationDDR SDRAM DIMMConnectors Notch DDR SDRAM slotEjectorsRib (inside slot)J14J12J11J1

Figure 4-1 DIMM installation for dual 2.3 and 2.7 GHz processor configurations 58Figure 4-2 DIMM installation for dual 2.0 GHz processor configuration

Important: DDR333 (PC2700) or slower DIMMs do not work in the Power Mac G5 computer.Important: DIMMs with any of the following features are not supp

The first column in Table 4-1 (page 61) shows the memory size of the largest DIMM with that device size thatthe computer can accommodate. The third co

PCI or PCI-X Expansion SlotsThe following sections define the PCI and PCI expansion requirements.PCI OnlySome configurations of the Power Mac G5 suppo

Note: The Power Mac G5’s build-to-order NVIDIA GeForce 6800 Ultra DDL graphics card occupiesboth the AGP slot and the adjacent PCI slot. As a result,

For more information about the technologies mentioned in this developer note, you may wish to consult someof the references listed in the following se

http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=02VS0l81285Nf23D GraphicsDevelopers of 3D graphics for games should know about OpenGL for

TN 2000: PCI Expansion ROMs and You , athttp://developer.apple.com/technotes/tn/tn2000.htmlTN 2001: Running Files from a Hard Drive in Open Firmware ,

EthernetFor information on Ethernet specifications and design guides, go to the World Wide Web athttp://standards.ieee.org/Serial ATAFor information o

You may also find useful information at the 1394 trade association’s website athttp://www.1394ta.org/Digital Visual InterfaceFor information about tra

This developer note uses the following typographical conventions and abbreviations.Typographical ConventionsNote: A note like this contains informati

Important: This document may not represent best practices for current development. Links to downloadsand other resources may no longer be valid.This

microsecondss1024KnanosecondsnskilobytesKBohmskilogramskgsecondsseckilohertzkHzvoltsVkilohmskwattsWpoundslbOther abbreviations used in developer notes

12 cm optical storage system with 4 GB capacityDVDDVD read-only memoryDVD-ROMDVD that is both readable and writableDVD-RAMDigital Visual InterfaceDVIe

International Organization for StandardizationISOJoint Electronics Devices Engineering CouncilJEDECI/O device and disk controllerK2level 2 (refers to

Serial Bus ProtocolSBPSerial Presence DetectSPDservice processor unitSPUSmall Computer System InterfaceSCSIserial communications controllerSCCsingle d

Apple Inc.Copyright © 2003, 2005 Apple Computer, Inc.All rights reserved.No part of this publication may be reproduced,stored in a retrieval system, o

The 64-bit desktop Power Mac G5 uses dual PowerPC G5 microprocessors and is intended for use in contentcreation, desktop publishing, multimedia, scien

Hardware Features SummaryBelow is a list of all of the hardware features of the Power Mac G5. The major features are described more fullylater in this