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• The fan header supports +12 V, 3-wire fans at 1 A maximum. For information about Refer to The locations of the fan header and thermal sensors Figure 6, page 29 The signal names of the system fan header Table 17, page 46 1.11.2.2 LAN Wake Capabilities LAN wake capabilities enable remote wake-up of the computer through a network. The LAN subsystem network adapter monitors network traffic at the Media Independent Interface. The board supports LAN wake capabilities with ACPI in the following ways: • By Ping • By Magic Packet Upon detecting the configured wake packet type, the LAN subsystem asserts a wake- up signal that powers up the computer. 1.11.2.3 Instantly Available PC Technology Instantly Available PC technology enables the board to enter the ACPI S3 (Suspend-to- RAM) sleep-state. While in the S3 sleep-state, the computer will appear to be off (the hard drive(s) and fan will power off, the front panel LED will blink). When signaled by a wake-up device or event, the system quickly returns to its last known state. Table 8 on page 32 lists the devices and events that can wake the computer from the S3 state. The board supports the PCI Bus Power Management Interface Specification. Add-in boards that also support this specification can participate in power management and can be used to wake the computer. 1.11.2.4 Wake from USB USB bus activity wakes the computer from an ACPI S3 state. NOTE Wake from USB requires the use of a USB peripheral that supports Wake from USB and support in the operating system. 1.11.2.5 PME# Signal Wake-up Support When the PME# signal on the PCI bus is asserted, the computer wakes from an ACPI S3, S4, or S5 state (with Wake on PME enabled in the BIOS). 1.11.2.6 Wake from PS/2 Devices PS/2 keyboard activity wakes the computer from an ACPI S3, S4, or S5 state. However, when the computer is in an ACPI S4 or S5 state, the only PS/2 activity that will wake the computer is the Alt + Print Screen or the Power Key available only on some keyboards. 1.11.2.7 WAKE# Signal Wake-up Support When the WAKE# signal on the PCI Express bus is asserted, the computer wakes from an ACPI S3, S4, or S5 state. 1.11.2.8 Wake from Serial Port Serial Port activity wakes the computer from an ACPI S3 state. 1.11.2.9 +5 V Standby Power Indicator LED The +5 V standby power indicator LED shows that power is still present even when the computer appears to be off. Figure 7 shows the location of the standby power indicator LED. CAUTION If AC power has been switched off and the standby power indicator is still lit, disconnect the power cord before installing or removing any devices connected to the board. Failure to do so could damage the board and any attached devices. Figure 7. Location of the Standby Power Indicator LED 2 Technical Reference 2.1 Memory Map 2.1.1 Addressable Memory The board utilizes 4 GB of addressable system memory. Typically the address space that is allocated for Conventional PCI bus add-in cards, PCI Express configuration space, BIOS (SPI Flash), and chipset overhead resides above the top of DRAM (total system memory). On a system that has 4 GB of system memory installed, it is not possible to use all of the installed memory due to system address space being allocated for other system critical functions. These functions include the following: • BIOS/ SPI Flash (2 MB) • Local APIC (19 MB) • Direct Media Interface (40 MB) • Internal graphics address registers • Memory-mapped I/O that is dynamically allocated for Conventional PCI add-in cards The amount of installed memory that can be used will vary based on add-in cards and BIOS settings. Figure 8 shows a schematic of the system memory map. All installed system memory can be used when there is no overlap of system addresses. Figure 8. Detailed System Memory Address Map Table 9 lists the system memory map. Table 9. System Memory Map Address Range (decimal) Address Range (hex) Size Description 1024 K - 4194304 K 100000 - FFFFFFFF 4095 MB Extended memory 960 K - 1024 K F0000 - FFFFF 64 KB Runtime BIOS 896 K - 960 K E0000 - EFFFF 64 KB Reserved 800 K - 896 K C8000 - DFFFF 96 KB Potential available high DOS memory (open to the PCI bus). Dependent on video adapter used. 640 K - 800 K A0000 - C7FFF 160 KB Video memory and BIOS 639 K - 640 K 9FC00 - 9FFFF 1 KB Extended BIOS data (movable by memory manager software) 512 K - 639 K 80000 - 9FBFF 127 KB Extended conventional memory 0 K - 512 K 00000 - 7FFFF 512 KB Conventional memory 2.2 Connectors and Headers CAUTION Only the following connectors/headers have overcurrent protection: Back panel and front panel USB, VGA, serial, and PS/2. The other internal connectors/headers 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/headers to power devices external to the computer’s chassis. A fault in the load presented by the external devices could cause damage to the computer, the power cable, and the e...