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2.2.3.4.4 Power Switch Header Pins 6 and 8 can be connected to a front panel momentary-contact power switch. The switch must pull the SW_ON# pin to ground for at least 50 ms to signal the power supply to switch on or off. (The time requirement is due to internal debounce circuitry on the board.) At least two seconds must pass before the power supply will recognize another on/off signal. 2.2.3.5 Front Panel USB 2.0 Headers Figure 16 and Figure 17 are connection diagrams for the front panel USB 2.0 headers. NOTE • The +5 V DC power on the USB headers is fused. • Use only a front panel USB connector that conforms to the USB 2.0 specification for high-speed USB devices. Figure 16. Connection Diagram for Front Panel USB 2.0 Dual-Port Headers Figure 17. Connection Diagram for the Front Panel USB 2.0 Single-Port Header 2.2.3.6 Debug Header 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 POST card that can interface with the Debug header. The POST card can decode the port and display the contents on a medium such as a seven-segment display. Table 37. Debug Header Pin Signal Name 1 VCC3 2 VCC3 3 PLTRST# 4 LPC_CLK 5 LAD0/FWH0 6 LAD1/FWH1 7 LAD2/FWH2 8 LAD3/FWH3 9 LFRAME/FWH4# 10 GND 11 GND 2.3 I/O Shields Two I/O shields are provided with the board: • Half-height I/O shield • Standard-height I/O shield The half-height I/O shield allows access to all back panel connectors while being specifically designed for thin mini-ITX chassis, compliant with version 2.0 of the Mini- ITX Addendum to the microATX Motherboard Interface Specification. As an added benefit for system configurations with an internal TV tuner in the PCI Express Mini Card form factor, the I/O shield also provides a pre-cut hole for user installation of an F-type external antenna connector. The standard-height I/O shield provides access to all the same connectors as the half- height I/O shield while being compatible with standard mini-ITX and microATX chassis. In addition to the F-type pre-cut hole, the standard-height I/O shield also provides pre-cut holes for user installation of two external wireless antennas for system configurations with wireless PCI Express Mini Card solutions. Figure 18 and Figure 19 are I/O shield reference diagrams. Figure 18. Half-Height Back Panel I/O Shield Figure 19. Standard-Height Back Panel I/O Shield For more information about Refer to Thin mini-ITX form factor Spec_V2_0.pdf 2.4 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 20 shows the location of the jumper block. The 3-pin jumper block determines the BIOS Setup program’s mode. Table 38 describes the jumper settings for the three modes: normal, configure, and recovery. When the jumper is set to configure mode and the computer is powered-up, the BIOS compares the processor version and the microcode version in the BIOS and reports if the two match. Figure 20. Location of the Jumper Block Table 38. BIOS Setup Configuration Jumper Settings Function/Mode Jumper Setting Configuration Normal 1-2 The BIOS uses current configuration information and passwords for booting. Configure 2-3 After the POST runs, Setup runs automatically. The maintenance menu is displayed. Note that this Configure mode is the only way to clear the BIOS/CMOS settings. Press F9 (restore defaults) while in Configure mode to restore the BIOS/CMOS settings to their default values. Recovery None The BIOS attempts to recover the BIOS configuration. A recovery CD or flash drive is required. 2.5 Mechanical Considerations 2.5.1 Form Factor The board is designed to fit into a Mini-ITX form-factor chassis. Figure 21 illustrates the mechanical form factor for the board. Dimensions are given in inches [millimeters]. The outer dimensions are 6.7 inches by 6.7 inches [170.18 millimeters by 170.18 millimeters]. Location of the I/O connectors and mounting holes are in compliance with the ATX specification. NOTE The board is designed to have a total height of less than 20 mm from the underside of the board to the top of its tallest components, including all back panel I/O ports, internal connectors, installed system memory, and factory-installed thermal solutions, in compliance with thin mini-ITX requirements per version 2 of the Mini-ITX Addendum to the microATX Motherboard Interface Specification. For more information about Refer to Thin mini-ITX form factor Spec_V2_0.pdf Figure 21. Board Dimensions 2.5.2 Board 3D View The Intel Desktop Board DH61AG has a 3D view as shown in Figure 22. Figure 22. 3D View of I...