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Table 8 on page 30 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. The use of Instantly Available PC technology requires operating system support and PCI 2.2 compliant add-in cards, PCI Express add-in cards, and drivers. 1.15.2.5 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 is supported by the operating system. 1.15.2.6 WAKE# Signal Wake-up Support When the WAKE# signal on a PCI Express add-in card is asserted, the computer wakes from an ACPI S3, S4, or S5 state. 1.15.2.7 Wake from Serial Port Serial port activity wakes the computer from an ACPI S3 state. 1.15.2.8 Wake from PS/2 Devices PS/2 device activity wakes the computer from an ACPI S3, S4, or S5 state. However, when the computer is in an S4 or S5 state, the only PS/2 activity that will wake the computer is the alt-PrtScrn key combination on the keyboard. 1.15.2.9 Wake from S5 When the RTC Date and Time is set in the BIOS, the computer will automatically wake from an ACPI S5 state. Intel Desktop Board DH61HO Technical Product Specification Technical Reference 2.1 Memory Resources 2.1.1 Addressable Memory The board utilizes 16 GB of addressable system memory. Typically the address space that is allocated for PCI Express configuration space, BIOS (SPI Flash device), and chipset overhead resides above the top of DRAM (total system memory). On a system that has 16 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 device (32 Mbit) • Local APIC (19 MB) • Direct Media Interface (40 MB) • PCI Express configuration space (256 MB) • PCH base address registers PCI Express ports (up to 256 MB) • Memory-mapped I/O that is dynamically allocated for PCI Express add-in cards (256 MB) The board provides the capability to reclaim the physical memory overlapped by the memory mapped I/O logical address space. The board remaps physical memory from the top of usable DRAM boundary to the 4 GB boundary to an equivalent sized logical address range located just above the 4 GB boundary. Figure 7 shows a schematic of the system memory map. All installed system memory can be used when there is no overlap of system addresses. Intel Desktop Board DH61HO Technical Product Specification Figure 7. Detailed System Memory Address Map Technical Reference 2.1.2 Memory Map Table 9 lists the system memory map. Table 9. System Memory Map Address Range (decimal) Address Range (hex) Size Description 1024 K -16777216K K 100000 – 400000000 16382 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 and headers have overcurrent protection: back panel and front panel USB and PS/2. The other internal connectors and 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 or 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 external devices themselves. Furthermore, improper connection of USB header single wire connectors may eventually overload the overcurrent protection and cause damage to the board. This section describes the board’s connectors. The connectors can be divided into these groups: • Back panel I/O connectors • Component-side I/O connectors and headers (see page 39) Intel Desktop Board DH61HO Technical Product Specification 2.2.1 Back Panel Connectors Figure 8 shows the location of the back panel connectors for the board. Item Description A PS/2 mouse connector B PS/2 keyboard connector C VGA connector D UBS 2.0 ports E LAN F USB 2.0 ports G Line in H Line out/front speakers I Mic in/side surround Figure 8. Back Panel Connectors NOTE The back panel audio line out connector is designed to power headphones or amplified speakers only. Poor audio quality occurs if passive (non-amplified) speakers are connected to this output. Technical Reference 2.2.2 Component-side Connectors and Headers Figure 9 shows the locations of the component-side connectors and headers. Fi...