Intel® Desktop Board D915PLWD Technical Product Specification June 2005 Order Number: D23930-001US The Intel® Desktop Board D915PLWD may contain design defects or errors known as errata that may cause the product to deviate from published specifications. Current characterized errata are documented in the Intel Desktop Board D915PLWD Specification Update.
Revision History Revision -001 Revision History First release of the Specification. Date Intel® Desktop Board D915PLWD Technical Product June 2005 This product specification applies to only standard Intel Desktop Board D915PLWD with BIOS identifier VG91510A.86A. Changes to this specification will be published in the Intel Desktop Board D915PLWD Specification Update before being incorporated into a revision of this document. INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS.
Preface This Technical Product Specification (TPS) specifies the board layout, components, connectors, power and environmental requirements, and the BIOS for the Intel® Desktop Board D915PLWD. It describes the standard product and available manufacturing options. Intended Audience The TPS is intended to provide detailed, technical information about the Desktop Board D915PLWD and its components to the vendors, system integrators, and other engineers and technicians who need this level of information.
Intel Desktop Board D915PLWD Technical Product Specification Other Common Notation iv # Used after a signal name to identify an active-low signal (such as USBP0#) (NxnX) When used in the description of a component, N indicates component type, xn are the relative coordinates of its location on the board, and X is the instance of the particular part at that general location. For example, J5J1 is a connector, located at 5J. It is the first connector in the 5J area.
Contents 1 Product Description 1.1 Overview.................................................................................................................... 10 1.1.1 Feature Summary........................................................................................ 10 1.1.2 Board Layout ............................................................................................... 12 1.1.3 Block Diagram .............................................................................................
Intel Desktop Board D915PLWD Technical Product Specification 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.7.3 Front Panel USB Connectors ........................................................................ 51 Jumper Block ............................................................................................................... 52 Mechanical Considerations .......................................................................................... 53 2.9.1 Form Factor .......................................
Contents Figures 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Board Components ...................................................................................................... 12 Block Diagram.............................................................................................................. 14 Memory Channel and DIMM Configuration .................................................................. 17 Dual Channel (Interleaved) Mode Configuration with Two DIMMs ...
Intel Desktop Board D915PLWD Technical Product Specification 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. viii States for a One-Color Power LED .............................................................................. 50 States for a Two-Color Power LED .............................................................................. 50 BIOS Setup Configuration Jumper Settings.................................................................
1 Product Description What This Chapter Contains 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 Overview ...................................................................................................................... 10 Online Support ............................................................................................................. 15 Processor ..................................................................................................................... 15 System Memory ............
Intel Desktop Board D915PLWD Technical Product Specification 1.1 Overview 1.1.1 Feature Summary Table 1 summarizes the major features of the board. Table 1. Feature Summary Form Factor ATX (12.00 inches by 9.60 inches [304.80 millimeters by 243.
Product Description Table 1. Feature Summary (continued) Expansion Capabilities • Four PCI Conventional* bus connectors • Two PCI Express x1 bus add-in card connectors • One PCI Express x16 bus add-in card connector Instantly Available PC Technology • Support for PCI Local Bus Specification Revision 2.2 • Support for PCI Express Revision 1.
Intel Desktop Board D915PLWD Technical Product Specification 1.1.2 Board Layout Figure 1 shows the location of the major components. A B C D E F G H I J K DD L M N CC BB O Z AA X Y V W U T S R Q P OM17971 Figure 1. Board Components Table 2 lists the components identified in Figure 1.
Product Description Table 2.
Intel Desktop Board D915PLWD Technical Product Specification 1.1.3 Block Diagram Figure 2 is a block diagram of the major functional areas of the board.
Product Description 1.2 Online Support To find information about… Visit this World Wide Web site: Intel Desktop Board D915PLWD under “Desktop Board Products” or “Desktop Board Support” http://www.intel.com/design/motherbd http://support.intel.com/support/motherboards/desktop Available configurations for the Desktop Board D915PLWD http://developer.intel.com/design/motherbd/wd/wd_available.htm Processor data sheets http://www.intel.com/design/litcentr ICH6 addressing http://developer.intel.
Intel Desktop Board D915PLWD Technical Product Specification 1.4 System Memory The board has two DIMM sockets and support the following memory features: • • 2.5 V (only) DDR SDRAM DIMMs with gold-plated contacts Unbuffered, single-sided or double-sided DIMMs with the following restriction: Double-sided DIMMS with x16 organization are not supported.
Product Description 1.4.1 Memory Configurations The Intel 82915PL MCH supports two types of memory organization: • • Dual channel (Interleaved) mode. This mode offers the highest throughput for real world applications. Dual channel mode is enabled when the installed memory capacities of both DIMM channels are equal. Technology and device width can vary from one channel to the other but the installed memory capacity for each channel must be equal.
Intel Desktop Board D915PLWD Technical Product Specification 1.4.1.1 Dual Channel (Interleaved) Mode Configuration Figure 4 shows a dual channel configuration using two DIMMs. In this example, the DIMM sockets are populated with identical DIMMs. 1 GB Channel A, DIMM 0 1 GB Channel B, DIMM 0 OM17974 Figure 4.
Product Description 1.4.1.2 Single Channel (Asymmetric) Mode Configurations NOTE Dual channel (Interleaved) mode configurations provide the highest memory throughput. Figure 5 shows a single channel configuration using one DIMM. In this example, only Channel A is populated. Channel B is not populated. 256 MB Channel A, DIMM 0 Channel B, DIMM 0 OM17975 Figure 5. Single Channel (Asymmetric) Mode Configuration with One DIMM Figure 6 shows a single channel configuration using two DIMMs.
Intel Desktop Board D915PLWD Technical Product Specification 1.5 Intel® 915PL Chipset The Intel 915PL chipset consists of the following devices: • • • Intel 82915PL Memory Controller Hub (MCH) with Direct Media Interface (DMI) interconnect Intel 82801FB I/O Controller Hub (ICH6) with DMI interconnect Firmware Hub (FWH) The MCH is a centralized controller for the system bus, the memory bus, the PCI Express bus, and the DMI interconnect. The ICH6 is a centralized controller for the board’s I/O paths.
Product Description 1.5.2.1 Parallel ATA IDE Interface The ICH6’s Parallel ATA IDE controller has one bus-mastering Parallel ATA IDE interface. The Parallel ATA IDE interface supports the following modes: • • • • • Programmed I/O (PIO): processor controls data transfer. 8237-style DMA: DMA offloads the processor, supporting transfer rates of up to 16 MB/sec. Ultra DMA: DMA protocol on IDE bus supporting host and target throttling and transfer rates of up to 33 MB/sec.
Intel Desktop Board D915PLWD Technical Product Specification 1.5.3 Real-Time Clock, CMOS SRAM, and Battery A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer is not plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in, the standby current from the power supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at 25 ºC with 3.3 VSB applied.
Product Description 1.7 Legacy I/O Controller The legacy I/O controller provides the following features: • • • • • • • One serial port One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP) support Serial IRQ interface compatible with serialized IRQ support for PCI Conventional bus systems PS/2-style mouse and keyboard interfaces Interface for one 1.44 MB or 2.
Intel Desktop Board D915PLWD Technical Product Specification 1.8 Audio Subsystem The board supports the Intel High Definition audio subsystem based on the Realtek ALC860VU codec. The audio subsystem supports the following features: • • • # Advanced jack sense (front and rear panel) that enables the audio codec to recognize the device that is connected to an audio port.
Product Description Intel® High Definition Audio Subsystem 1.8.3 The Intel High Definition Audio subsystem includes the following: • • • Intel 82801FB I/O Controller Hub (ICH6) Realtek ALC860VU audio codec Microphone input that supports a single dynamic, condenser, or electret microphone The front and back audio connectors are configurable through the audio device drivers. The available configurable audio ports are shown in Figure 7.
Intel Desktop Board D915PLWD Technical Product Specification 1.9 LAN Subsystem The LAN subsystem consists of the following: • • Physical layer interface device Intel 82562GZ PLC for 10/100 Mbits/sec Ethernet LAN connectivity. RJ-45 LAN connector with integrated status LEDs Additional features of the LAN subsystem include: • • • CSMA/CD protocol engine LAN connect interface that supports the 82562GZ PCI Conventional bus power management ⎯ Supports ACPI technology ⎯ Supports LAN wake capabilities 1.9.
Product Description Table 5 describes the LED states when the board is powered up and the 10/100 Mbits/sec LAN subsystem is operating. Table 5. LAN Connector LED States LED Color LED State Condition Green Off LAN link is not established. On LAN link is established. Blinking LAN activity is occurring. Off 10 Mbits/sec data rate is selected. On 100 Mbits/sec data rate is selected. Yellow 1.9.2 LAN Subsystem Software LAN software and drivers are available from Intel’s World Wide Web site.
Intel Desktop Board D915PLWD Technical Product Specification 1.10.2 Thermal Monitoring Figure 10 shows the location of the sensors and fan connectors. 3 1 A 4 C 1 B D 1 3 F E OM17977 Item Description A Remote ambient temperature sensor B Thermal diode, located on processor die C Ambient temperature sensor, internal to hardware monitoring and fan control ASIC D Processor fan E Rear chassis fan F Front chassis fan Figure 10.
Product Description 1.10.3 Fan Monitoring Fan monitoring can be implemented using Intel® Desktop Utilities or third-party software. The level of monitoring and control is dependent on the hardware monitoring ASIC used with the Desktop Board. For information about Refer to The functions of the fan connectors Section 1.11.2.2, page 33 1.10.4 Chassis Intrusion and Detection The board supports a chassis security feature that detects if the chassis cover is removed.
Intel Desktop Board D915PLWD Technical Product Specification Table 6 lists the system states based on how long the power switch is pressed, depending on how ACPI is configured with an ACPI-aware operating system. Table 6. Effects of Pressing the Power Switch If the system is in this state… Off (ACPI G2/G5 – Soft off) On (ACPI G0 – working state) On (ACPI G0 – working state) Sleep (ACPI G1 – sleeping state) Sleep (ACPI G1 – sleeping state) 1.11.1.
Product Description Table 7. Power States and Targeted System Power Global States G0 – working state G1 – sleeping state Sleeping States S0 – working Processor States C0 – working S1 – Processor stopped C1 – stop grant G1 – sleeping state S3 – Suspend to RAM. Context saved to RAM. S4 – Suspend to disk. Context saved to disk. S5 – Soft off. Context not saved. Cold boot is required. No power to the system.
Intel Desktop Board D915PLWD Technical Product Specification 1.11.1.3 Wake-up Devices and Events Table 8 lists the devices or specific events that can wake the computer from specific states. Table 8.
Product Description Resume on Ring enables telephony devices to access the computer when it is in a power-managed state. The method used depends on the type of telephony device (external or internal). NOTE The use of Resume on Ring and Wake from USB technologies from an ACPI state requires an operating system that provides full ACPI support. 1.11.2.1 Power Connector ATX12V-compliant power supplies can turn off the system power through system control.
Intel Desktop Board D915PLWD Technical Product Specification Magic Packet* frame, the LAN subsystem asserts a wake-up signal that powers up the computer. Depending on the LAN implementation, the board supports LAN wake capabilities with ACPI in the following ways: • • • 1.11.2.4 The PCI Express WAKE# signal The PCI Conventional bus PME# signal for PCI 2.
Product Description 1.11.2.8 PME# Signal Wake-up Support When the PME# signal on the PCI Conventional bus is asserted, the computer wakes from an ACPI S1, S3, S4, or S5 state (with Wake on PME enabled in BIOS). 1.11.2.9 WAKE# Signal Wake-up Support When the WAKE# signal on the PCI Express bus is asserted, the computer wakes from an ACPI S1, S3, S4, or S5 state. 1.11.2.
Intel Desktop Board D915PLWD Technical Product Specification 36
2 Technical Reference What This Chapter Contains 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 Memory Map ................................................................................................................ 37 DMA Channels ............................................................................................................. 38 Fixed I/O Map...............................................................................................................
Intel Desktop Board D915PLWD Technical Product Specification 2.2 DMA Channels Table 10.
Technical Reference 2.3 Fixed I/O Map Table 11. I/O Map Address (hex) Size Description 0000 - 00FF 256 bytes Used by the Desktop Board D915PLWD. Refer to the ICH6 data sheet for dynamic addressing information.
Intel Desktop Board D915PLWD Technical Product Specification 2.4 PCI Configuration Space Map Table 12.
Technical Reference 2.5 Interrupts The interrupts can be routed through either the Programmable Interrupt Controller (PIC) or the Advanced Programmable Interrupt Controller (APIC) portion of the ICH6 component. The PIC is supported in Windows 98 SE and Windows ME and uses the first 16 interrupts. The APIC is supported in Windows 2000 and Windows XP and supports a total of 24 interrupts. Table 13.
Intel Desktop Board D915PLWD Technical Product Specification 2.6 PCI Conventional* Interrupt Routing Map This section describes interrupt sharing and how the interrupt signals are connected between the PCI Conventional bus connectors and onboard PCI Conventional devices. The PCI Conventional specification describes how interrupts can be shared between devices attached to the PCI Conventional bus.
Technical Reference 2.7 Connectors CAUTION Only the following connectors have overcurrent protection: back panel USB, front panel USB, and PS/2. The other internal connectors are not overcurrent protected and should connect only to devices inside the computer’s chassis, such as fans and internal peripherals. Do not use these connectors to power devices external to the computer’s chassis.
Intel Desktop Board D915PLWD Technical Product Specification 2.7.2 Component-side Connectors Figure 13 shows the locations of the component-side connectors. A B D E F C 1 2 9 10 G H I J 1 3 3 4 3 1 2 1 1 1 1 1 10 9 2 1 3 1 1 4 1 1 2 10 1 24 2 23 40 2 2 1 34 1 33 39 1 X U W V S T Q R O N M L K P OM17980 Figure 13.
Technical Reference Table 16 lists the component-side connectors identified in Figure 13. Table 16.
Intel Desktop Board D915PLWD Technical Product Specification Table 17.
Technical Reference 2.7.2.1 Power Supply Connectors The board has three power supply connectors: • • Main power – a 2 x 12 connector. This connector is compatible with 2 x 10 connectors previously used on Intel desktop boards. The board supports the use of ATX12V power supplies with either 2 x 10 or 2 x 12 main power cables. When using a power supply with a 2 x 10 main power cable, attach that cable on the rightmost pins of the main power connector, leaving pins 11, 12, 23, and 24 unconnected.
Intel Desktop Board D915PLWD Technical Product Specification 2.7.2.2 Add-in Card Connectors The board has the following add-in card connectors: • • • PCI Express x16: one connector supporting simultaneous transfer speeds up to 8 GBytes/sec. PCI Express x1: two PCI Express x1 connectors. The x1 interfaces support simultaneous transfer speeds up to 500 MBytes/sec. PCI Conventional (rev 2.3 compliant) bus: four PCI Conventional bus add-in card connectors.
Technical Reference 2.7.2.4 Front Panel Connector This section describes the functions of the front panel connector. Table 25 lists the signal names of the front panel connector. Figure 14 is a connection diagram for the front panel connector. Table 25.
Intel Desktop Board D915PLWD Technical Product Specification 2.7.2.4.2 Reset Switch Connector [Purple] Pins 5 and 7 [Purple] can be connected to a momentary single pole, single throw (SPST) type switch that is normally open. When the switch is closed, the board resets and runs the POST. 2.7.2.4.3 Power/Sleep LED Connector [Green] Pins 2 and 4 [Green] can be connected to a one- or two-color LED. Table 26 shows the possible states for a one-color LED.
Technical Reference 2.7.3 Front Panel USB Connectors Figure 15 is a connection diagram for the front panel USB connectors. # INTEGRATOR’S NOTES • • • • The +5 V DC power on the USB connector is fused. Pins 1, 3, 5, and 7 comprise one USB port. Pins 2, 4, 6, and 8 comprise one USB port. Use only a front panel USB connector that conforms to the USB 2.0 specification for highspeed USB devices.
Intel Desktop Board D915PLWD Technical Product Specification 2.8 Jumper Block CAUTION Do not move the jumper with the power on. Always turn off the power and unplug the power cord from the computer before changing a jumper setting. Otherwise, the board could be damaged. Figure 16 shows the location of the jumper block. The jumper block determines the BIOS Setup program’s mode. Table 28 describes the jumper settings for the three modes: normal, configure, and recovery.
Technical Reference 2.9 Mechanical Considerations 2.9.1 Form Factor The board is designed to fit into an ATX-form-factor chassis. Figure 17 illustrates the mechanical form factor of the board. Dimensions are given in inches [millimeters]. The outer dimensions are 12.00 inches by 9.60 inches [304.80 millimeters by 243.84 millimeters]. Location of the I/O connectors and mounting holes are in compliance with the ATX specification. 1.800 [45.72] 6.500 [165.10] 6.100 [154.94] 5.200 [132.08] 0.00 2.850 [72.
Intel Desktop Board D915PLWD Technical Product Specification 2.9.2 I/O Shield The back panel I/O shield for the board must meet specific dimension and material requirements. Systems based on this board need the back panel I/O shield to pass certification testing. Figure 18 shows the I/O shield. Dimensions are given in inches to a tolerance of ±0.02 inches. The figure also indicates the position of each cutout.
Technical Reference 2.10 Electrical Considerations 2.10.1 DC Loading Table 29 lists the DC loading characteristics of the board. This data is based on a DC analysis of all active components within the board that impact its power delivery subsystems. The analysis does not include PCI add-in cards. Minimum values assume a light load placed on the board that is similar to an environment with no applications running and no USB current draw.
Intel Desktop Board D915PLWD Technical Product Specification 2.10.3 Fan Connector Current Capability CAUTION The processor fan must be connected to the processor fan connector, not to a chassis fan connector. Connecting the processor fan to a chassis fan connector may result in onboard component damage that will halt fan operation. Table 30 lists the current capability of the fan connectors. Table 30.
Technical Reference 2.11 Thermal Considerations CAUTION A chassis with a maximum internal ambient temperature of 38 oC at the processor fan inlet is a requirement. Use a processor heatsink that provides omni-directional airflow (similar to the type shown in Figure 19) to maintain required airflow across the processor voltage regulator area. OM16996 Figure 19.
Intel Desktop Board D915PLWD Technical Product Specification CAUTION Ensure that proper airflow is maintained in the processor voltage regulator circuit. Failure to do so may result in damage to the voltage regulator circuit. The processor voltage regulator area (item A in Figure 20) can reach a temperature of up to 85 oC in an open chassis. Figure 20 shows the locations of the localized high temperature zones.
Technical Reference Table 31 provides maximum case temperatures for the components that are sensitive to thermal changes. The operating temperature, current load, or operating frequency could affect case temperatures. Maximum case temperatures are important when considering proper airflow to cool the board. Table 31.
Intel Desktop Board D915PLWD Technical Product Specification 2.13 Environmental Table 32 lists the environmental specifications for the board. Table 32.
Technical Reference 2.14 Regulatory Compliance This section describes the Desktop Boards’ compliance with U.S. and international safety and electromagnetic compatibility (EMC) regulations. 2.14.1 Safety Regulations Table 33 lists the safety regulations the Desktop Board D915PLWD complies with when correctly installed in a compatible host system. Table 33.
Intel Desktop Board D915PLWD Technical Product Specification 2.14.2.1 FCC Compliance Statement (USA) Product Type: D915PLWD Desktop Board This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Technical Reference Dutch Dit product is in navolging van de bepalingen van Europees Directief 89/336/EEC & 73/23/EEC. Suomi Tämä tuote noudattaa EU-direktiivin 89/336/EEC & 73/23/EEC määräyksiä. Français Ce produit est conforme aux exigences de la Directive Européenne 89/336/EEC & 73/23/EEC. Deutsch Dieses Produkt entspricht den Bestimmungen der Europäischen Richtlinie 89/336/EEC & 73/23/EEC. Icelandic Þessi vara stenst reglugerð Evrópska Efnahags Bandalagsins númer 89/336/ EEC & 73/23/EEC.
Intel Desktop Board D915PLWD Technical Product Specification 2.14.5 Product Certification Markings (Board Level) Table 35 lists the board’s product certification markings. Table 35. Product Certification Markings Description Marking UL joint US/Canada Recognized Component mark. Includes adjacent UL file number for Intel Desktop Boards: E210882 (component side). FCC Declaration of Conformity logo mark for Class B equipment; includes Intel name and D915PLWD model designation (component side). CE mark.
3 Overview of BIOS Features What This Chapter Contains 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 Introduction .................................................................................................................. 65 BIOS Flash Memory Organization ............................................................................... 66 Resource Configuration ............................................................................................... 66 System Management BIOS (SMBIOS) .....................
Intel Desktop Board D915PLWD Technical Product Specification Table 36 lists the BIOS Setup program menu features. Table 36.
Overview of BIOS Features to PIO Mode 3 or 4, depending on the capability of the drive. You can override the autoconfiguration options by specifying manual configuration in the BIOS Setup program. To use ATA-66/100 features the following items are required: • • • An ATA-66/100 peripheral device An ATA-66/100 compatible cable ATA-66/100 operating system device drivers NOTE Do not connect an ATA device as a slave on the same IDE cable as an ATAPI master device.
Intel Desktop Board D915PLWD Technical Product Specification 5. The operating system loads. While the operating system is loading, USB keyboards and mice are recognized and may be used to configure the operating system. 6. After the operating system loads the USB drivers, all legacy and non-legacy USB devices are recognized by the operating system, and Legacy USB support from the BIOS is no longer used.
Overview of BIOS Features 3.7 Boot Options In the BIOS Setup program, the user can choose to boot from a diskette drive, hard drives, CD-ROM, or the network. The default setting is for the diskette drive to be the first boot device, the hard drive second, and the ATAPI CD-ROM third. The fourth device is disabled. 3.7.1 CD-ROM Boot Booting from CD-ROM is supported in compliance to the El Torito bootable CD-ROM format specification.
Intel Desktop Board D915PLWD Technical Product Specification 3.8 Adjusting Boot Speed These factors affect system boot speed: • • 3.8.1 Selecting and configuring peripherals properly Optimized BIOS boot parameters Peripheral Selection and Configuration The following techniques help improve system boot speed: • • • • 3.8.2 Choose a hard drive with parameters such as “power-up to data ready” less than eight seconds, that minimize hard drive startup delays.
Overview of BIOS Features 3.9 BIOS Security Features The BIOS includes security features that restrict access to the BIOS Setup program and who can boot the computer. A supervisor password and a user password can be set for the BIOS Setup program and for booting the computer, with the following restrictions: • • • • • • • The supervisor password gives unrestricted access to view and change all the Setup options in the BIOS Setup program. This is the supervisor mode.
Intel Desktop Board D915PLWD Technical Product Specification 72
4 Error Messages and Beep Codes What This Chapter Contains 4.1 4.2 4.3 4.4 4.5 BIOS Error Messages .................................................................................................. 73 Port 80h POST Codes ................................................................................................. 75 Bus Initialization Checkpoints ...................................................................................... 79 Speaker ............................................................
Intel Desktop Board D915PLWD Technical Product Specification Table 40. BIOS Error Messages (continued) Error Message Explanation Update OK! NVRAM was invalid and has been updated. Updated Failed NVRAM was invalid but was unable to be updated. Keyboard Error Error in the keyboard connection. Make sure keyboard is connected properly. KB/Interface Error Keyboard interface test failed. Memory Size Decreased Memory size has decreased since the last boot.
Error Messages and Beep Codes 4.2 Port 80h POST Codes During the POST, the BIOS generates diagnostic progress codes (POST-codes) to I/O port 80h. If the POST fails, execution stops and the last POST code generated is left at port 80h. This code is useful for determining the point where an error occurred. Displaying the POST-codes requires a PCI bus add-in card, often called a POST card. The POST card can decode the port and display the contents on a medium such as a seven-segment display.
Intel Desktop Board D915PLWD Technical Product Specification Table 43. Runtime Code Uncompressed in F000 Shadow RAM Code Description of POST Operation 03 NMI is Disabled. To check soft reset/power-on. 05 BIOS stack set. Going to disable cache if any. 06 POST code to be uncompressed. 07 CPU init and CPU data area init to be done. 08 CMOS checksum calculation to be done next. 0B Any initialization before keyboard BAT to be done next. 0C KB controller I/B free.
Error Messages and Beep Codes Table 43. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation 40 To prepare the descriptor tables. 42 To enter in virtual mode for memory test. 43 To enable interrupts for diagnostics mode. 44 To initialize data to check memory wrap around at 0:0. 45 Data initialized. Going to check for memory wrap around at 0:0 and finding the total system memory size. 46 Memory wrap around test done. Memory size calculation over.
Intel Desktop Board D915PLWD Technical Product Specification Table 43. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation 84 Lock-key checking over. To check for memory size mismatch with CMOS. 85 Memory size check done. To display soft error and check for password or bypass setup. 86 Password checked. About to do programming before setup. 87 Programming before setup complete. To uncompress SETUP code and execute CMOS setup.
Error Messages and Beep Codes Table 43. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation AE Uncompress SMBIOS module and init SMBIOS code and form the runtime SMBIOS image in shadow. B1 Going to copy any code to specific area. 00 Copying of code to specific area done. Going to give control to INT-19 boot loader. 4.3 Bus Initialization Checkpoints The system BIOS gives control to the different buses at several checkpoints to do various tasks.
Intel Desktop Board D915PLWD Technical Product Specification Table 46 describes the lower nibble of the high byte and indicates the bus on which the routines are being executed. Table 46. Lower Nibble High Byte Functions Value Description 0 Generic DIM (Device Initialization Manager) 1 On-board System devices 2 ISA devices 3 EISA devices 4 ISA PnP devices 5 PCI devices 4.4 Speaker A 47 Ω inductive speaker is mounted on the board.
