IBM CMX58886CX Legacy Mode and Native Mode IDE, Configuring the ATA/IDE Disk Chip Socket

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Legacy Mode and Native Mode IDE

The onboard EIDE controller may be configured as a either a Legacy or Native Mode IDE controller in the BIOS Setup. However, the operating system must support the selected mode for the device to operate correctly. The default configuration for the controller is Legacy Mode, as this is supported by most operating systems.

Legacy Mode

Legacy mode is the default configuration of the onboard EIDE controller. When in this mode, the controller will be fixed to use two interrupts: IRQs 14 and 15. Similarly, the I/O address of the controller will be fixed in the system. When in Legacy Mode, only a primary and secondary channel m ay be used in the system.

Native Mode

Native Mode allows more flexibility, as the system resources used by the IDE controller may be modified. When in Native Mode, the IDE controller only requires a single IRQ. Unlike Legacy Mode, this IRQ may be changed by the user or the operating system for better distriution of the system IRQs. When IRQs in the system are more evenly distributed, interrupt latency is minimized. The base address of the controller may also be modified.

Configuring the ATA/IDE Disk Chip Socket

The cpuModule was designed to be used in embedded computing applications. In such environments, magnetic media like hard disks and floppy disks are not very desirable. It is possible to eliminate magnetic storage devices by placing your operating system and application software into the cpuModule's ATA/IDE Disk Chip socket.

Before installing a device in the ATA/IDE Disk Chip socket, it is highly recommend to first configure the secondary IDE controller and device mode in the BIOS setup.

The secondary IDE controller must be enabled in the BIOS to allow read and write access to the device. When a device is installed in the socket, it will always appear as a master on the cpuModule’s secondary IDE controller.

From the BIOS setup screen, the user can also configure whether the socket contains a DMA mode or PIO mode device.

•DMA Mode: DMA mode will reduce CPU overhead. This mode can be set use multi-word DMA.

•PIO Mode: When the socket is in PIO mode, PIO transfers are supported. PIO Mode supports write protection.

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Contents CMX58886CX cpuModules BDM-610000050 Revision aRevision History Revision Date Reason for Change 06/30/06 Initial releaseCMX58886CX cpuModules Iv CMX58886CX cpuModule Table of Contents Audio CN11 MultiPort CN6Memory Map Address Map BDM-610000050 Rev a Vii System Recovery Application NotesChapter CMX58886CX cpuModules CMX58886CX cpuModule top viewError-Correction Codes Thermal Monitor and Thermal ThrottlingADIO with Wake-on-aDIO CMX58886CX Model Options Cable Kits and AccessoriesOrdering Information CMX58886CX cpuModule Model OptionsBoard Features VGA, SVGA, XGA, SXGA, Uxga Bios Block Diagram CMX58886CX cpuModule Simplified Block DiagramPower Consumption SpecificationsPhysical Characteristics Operating ConditionsSymbol Parameter Test Condition Min Max Electrical CharacteristicsElectrical Characteristics Ioc12 CMX58886CX cpuModule Contact Information 14 CMX58886CX cpuModule Getting Started Connector Locations CMX58886CX Connector LocationsCMX58886CX Basic Connectors Connecting a Keyboard Connecting the Utility CableConnecting to the PC/104-PlusPCI Bus PCI Bus Expansion Card Power Slot Selection SwitchesPCI Bus Signaling Levels Booting the CMX58886CX cpuModule for the First Time Connecting the cpuModule 22 CMX58886CX cpuModule Fan Power +5 Pin Auxiliary Power Connector CN31 Auxiliary Power CN3Pin Signal Function Reserved Power Supply Protection+3.3 +12 Pin Signal Function In/Out Utility Port Connector CN5Utility Port Connector CN5 SpeakerKeyboard System ResetSoft Power Button MouseBattery Svga Video Connector CN18 Svga Video Connector CN18Svga Video Resolutions Resolution Colors Refresh RatesManufacturer Model Number Resolution Color Depth Lvds Flat Panel Video Connector CN19Flat Panel Video Connector CN19 Tested Lvds PanelsEide Connector CN101 Eide Connector CN10Pin Signal ATA/IDE Disk Chip Socket U16 ATA/IDE Disk Chip Socket U161Serial Port in RS-232 Mode RS-232 Serial Port DefaultSerial Port Settings Serial Port 1 CN7 and Serial Port 2 CN8Full-Duplex Connections Half-Duplex RS-485 ModeRS-422 or RS-485 Serial Port PortSerial Port in RS-422/485 Mode Pin Signal Function In/Out DB-9MultiPort aDIO Pinout MultiPort Configured as an Advanced Digital I/O aDIO PortMultiPort CN6 CN6 Pin FunctionMultiPort Connector CN6 as a Parallel Port MultiPort Configured as a Parallel PortCN6 Pin Signal Function In/Out DB-25 MultiPort Connector Floppy Pinout CN61 MultiPort Configured as a Floppy Drive ControllerCN6 Pin Function DB-25 Floppy Drive Pin USB 2.0 Connector CN17 USB Connector CN17Ethernet Connector CN20 Ethernet 10/100Base-T and -TX Connector CN20RJ-45 Pin Pin DIL Pin Signal Function In/Out Pin DIL Pin Signal Function In/Out Audio Connector CN11Audio CN11 PC/104-PlusPCI Bus CN16 PC/104-PlusBus Signal Assignments1Pin PC/104-PlusPCI Bus Signals Address and DataPower Supplies and VIO Bridge Link CN4 Bridge Link CN4Optional RTC Battery Input CN13 External Power Management CN12Fan Power, +5 V CN14 Fan Power, Switched CN15 Fan Power, Switched CN15Using the cpuModule Entering the Bios Setup RTD Enhanced AMI BiosConfiguring the RTD Enhanced AMI Bios Setup KeysMain Menu Setup Fields Main Menu Setup FieldsPower On Self Test Post Codes Field Active Keys SelectionsBooting to Boot Block Flash with Fail Safe Boot ROM First Megabyte Memory Map Memory MapAddress hex Description O Addresses Reserved for the CMX58886CX cpuModule Address MapAddress Range hex Bytes Device Hardware Interrupts Interrupt Normal Use TimerHardware Interrupts Used on the CMX58886CX cpuModule Port 0 Data I/O Address 450h MultiPort Advanced Digital I/O Ports aDIODigital I/O Register Set Port 1 Data I/O Address 451hDIO-Control I/O Address 453h-Write Access DIO-Control I/O Address 453h-Read AccessMulti-Function at Address 452h1 Wake Control I/O Address 451h =Interrupt is enabledInterrupts =Interrupt triggers a Wake EventWake-on-aDIO WakeEnable Int Mask FunctionInterrupt and Wake Event Generation AC’97 Audio MultiPort Parallel Port ControlMultiPort Floppy Drive Ethernet 10/100Base-T and -TXCable Modes IDE Controller ConfigurationCable Detection Legacy Mode and Native Mode IDE Configuring the ATA/IDE Disk Chip SocketReal Time Clock Registers Real Time Clock ControlRegisters Number Function Watchdog Timer Control Wake Control I/O Address 455hFurther Temperature Reduction Fan ModeThermal Management Advanced Configuration and Power Interface Acpi Power ManagementAdvanced Power Management APM Power Button ModesAT vs. ATX Power Supplies ATX Power Supply SignalsReducing Power Consumption Multi-Color LED I/O Address 456h Multi-Color LEDLED Colors Manual LED Colors70 CMX58886CX cpuModule Reset Status I/O Address 457h Read Access Reset Status RegisterReset Status I/O Address 457h Write Access Reset Status Description and Priorites Address Reset DescriptionUser Eeprom I/O Address 456h Bit Signal Function Read / WriteUser Eeprom Eeprom Register DescriptionFeatures and Settings That Can Affect Boot Time Loading Default Bios Settings System RecoveryBooting to the Fail Safe Boot ROM Fsbr How long does it take to respond to an interrupt? What happens when an interrupt occurs?Basic Interrupt Information for Programmers Interrupt Request LinesPCI Interrupts Writing an Interrupt Service Routine ISRIntel 8259 Programmable Interrupt Controller Sample Code78 CMX58886CX cpuModule Appendix a Hardware Reference Jumper Settings and Locations Pins 1-2 +3.3 Pins 2-3 +5 Jumper Pins Function DefaultPins 1-2 +5 Pins 2-3 +3.3 Pins 1-2 +12 Pins 2-3 +5CMX58886CX Solder Blobs Solder Positions Function Default BlobPositions 1-2 +5 Positions 2-3 +3.3 Onboard PCI Devices Onboard PCI DevicesDevice ID Vendor ID Description Physical Dimensions CMX58886CX Physical Dimensions ±0.005 inchesAppendix B Troubleshooting Troubleshooting Common Problems and SolutionsProblem Cause Solution Troubleshooting a PC/104-PlusSystem Troubleshooting cont’dHow to Obtain Technical Support Appendix C Idan Dimensions and Pinout Idan Dimensions and Connectors IDAN-CMX58886CX ConnectorsIdan Pin # Signal Function PS/2 Mouse 6-Pin mini-DIN Connector femaleKeyboard 6-Pin mini-DIN Connector female External I/O ConnectionsCOM1/COM2 RS-422/485 9-Pin D Connector male COM1/COM2 RS-232 9-Pin D Connector maleIdan Pin # Signal Function Mode MultiPort 25-Pin D Connector female Idan Pin # ADIO Port Parallel Port Floppy Port CPU Pin #Panel 25-Pin mini D Connector female Idan Pin # Signal Name CPU Pin #Svga 15-Pin High Density D Connector female Idan Pin # Signal Function CPU Pin #Ethernet 9-Pin D Connector female USB 9-Pin D Connector maleIdan Pin # 10Base-T Signal CPU Pin # Audio 9-Pin D Connector female Idan Pin # Signal CPU Pin #98 CMX58886CX cpuModule Drivers and Example Programs PC/104 and PC/104-PlusSpecificationsApplication Notes Interrupt Programming100 CMX58886CX cpuModule Appendix E Limited Warranty 102 CMX58886CX cpuModule