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Failure to do so could damage the board and any attached devices. Figure 7. Location of the Standby Power LED (Green) 2 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 Conventional PCI bus add-in cards, 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 Conventional PCI and 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 8 shows a schematic of the system memory map. All installed system memory can be used when there is no overlap of system addresses. OM21680 Figure 8. Detailed System Memory Address Map 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 – 16777216 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 42) 2.2.1 Back Panel Connectors Figure 9 shows the location of the back panel connectors for the board. Item Description A PS/2 keyboard/mouse connector B USB 2.0 ports C VGA connector D Parallel port E LAN F USB 2.0 ports G Line in H Line out/front speakers I Mic in/side surround Figure 9. 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. 2.2.2 Component-side Connectors and Headers Figure 10 shows the locations of the component-side connectors and headers. Figure 10. Component-side Connectors and Headers Table 10 lists the component-side connectors and headers identified in Figure 10. Table 10. Component-side Connectors and Headers Shown in Figure 10 Item/callout from Figure 10 Description A Conventional PCI bus add-in card connector B Chassis intrusion header C S/PDIF header D PCI Express x1 add-in card connector E PCI Express x16 bus add-in card connector F 12 V internal power connector (ATX12V) G Rear chassis fan header H Processor fan header I LPC Debug header J TPM header K Main power connector (2 x 12) L SATA connectors M Front panel header N Serial port header O Front panel USB 2.0 header P Front panel audio header 2.2.2.1 Signal Tables for the Connectors and Headers Table 11. TPM Header Pin Signal Name Pin Signal Name 1 CK_33M_TPM_DIP 2 Ground 3 LFRAME# 4 Key (no pin) 5 PLTRST# 6 No connection 7 LAD3 8 LAD2 9 +3.3 V 10 LAD1 11 LAD0 12 Ground 13 No connection 14 No connection 15 +3.3 VSB 16 TPM_SERRQ 17 Ground 18 TPM_CLKRUN# 19 LPCPD# 20 No connection Table 12. Serial Port Header Pin Signal Name Pin Signal Name 1 DCD (Data Carrier Detect) 2 RXD# (Receive Data) 3 TXD# (Transmit Data) 4 DTR (Data Terminal Ready) 5 Ground 6 DSR (Data Set Ready) 7 RTS (Request To Send) 8 CTS (Clear To Send) 9 RI (Ring Indicator) 10 Key (no pin) Table 13. S/P...