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Front Panel USB Header Pin Signal Name Pin Signal Name 1 +5 VDC 2 +5 VDC 3 D4 D5 D+ 6 D+ 7 Ground 8 Ground 9 KEY (no pin) 10 No Connect Table 17. Front Panel USB Header with Intel Z-U130 USB Solid-State Drive or Compatible Device Support Pin Signal Name Pin Signal Name 1 +5 VDC 2 NC 3 D4 NC 5 D+ 6 NC 7 Ground 8 NC 9 KEY (no pin) 10 LED# Technical Reference 2.2.2.2 Add-in Card Connectors The board has the following add-in card connectors: • PCI Express Full-/Half-Mini Card slot • Conventional PCI bus connector (with riser card support for up to two PCI cards) Note the following considerations for the Conventional PCI bus connector: • The Conventional PCI bus connector is bus master capable. • SMBus signals are routed to the Conventional PCI bus connector. This enables Conventional PCI bus add-in boards with SMBus support to access sensor data on the board. The specific SMBus signals are as follows: . The SMBus clock line is connected to pin A40. . The SMBus data line is connected to pin A41. The Conventional PCI bus connector also supports single-slot and dual-slot riser cards for use of up to two bus master PCI expansion cards. In order to support two PCI bus master expansion cards, the riser card must support the following PCI signal routing: • Pin A11: additional 33 MHz PCI clock • Pin B10: additional PCI Request signal (i.e., PREQ#2) • Pin B14: additional PCI Grant signal (i.e., GNT#2) NOTE BIOS IRQ programming for the second PCI slot on PCI riser card: • ID_SEL: AD20 (Device 4) • Second PCI slot INT Mapping: . INT A# (A6) .INT D# of mother board PCI slot. . INT B# (B7) .INT A# of mother board PCI slot. . INT C# (A7) .INT B# of mother board PCI slot. . INT D# (B8) .INT C# of mother board PCI slot. NOTE The Conventional PCI slot on this board does not support the PCI PHOLD1 function. Due to this limitation (errata), certain PCI cards may experience performance or detection issues when DMA transfer is used as part of the PCI card operation. 1 PHOLD is the signal required to hold the bus during DMA transfers. Intel Desktop Board D2550DC2 Technical Product Specification 2.2.2.3 Power Supply Connector The board has a 2 x 12 power connector (see Table 18). This board requires a TFX12V or SFX12V power supply. Table 18. Power Connector Pin Signal Name Pin Signal Name 1 +3.3 V 13 +3.3 V 2 +3.3 V 14 -12 V 3 Ground 15 Ground 4 +5 V 16 PS-ON# (power supply remote on/off) 5 Ground 17 Ground 6 +5 V 18 Ground 7 Ground 19 Ground 8 PWRGD (Power Good) 20 No connect 9 +5 V (Standby) 21 +5 V 10 +12 V 22 +5 V 11 +12 V 23 +5 V 12 No connect 24 Ground Technical Reference 2.2.2.4 Front Panel Header This section describes the functions of the front panel header. Table 19 lists the signal names of the front panel header. Figure 12 is a connection diagram for the front panel header. Table 19. Front Panel Header Pin Signal In/ Out Description Pin Signal In/ Out Description Hard Drive Activity LED Power LED 1 HD_PWR Out Hard disk LED pull-up to +5 V 2 HDR_BLNK_GRN Out Front panel green LED 3 HDA# Out Hard disk active LED 4 HDR_BLNK_YEL Out Front panel yellow LED Reset Switch On/Off Switch 5 Ground Ground 6 FPBUT_IN In Power switch 7 FP_RESET# In Reset switch 8 Ground Ground Power Not Connected 9 +5 V Power 10 N/C Not connected Figure 12. Connection Diagram for Front Panel Header Intel Desktop Board D2550DC2 Technical Product Specification 2.2.2.4.1 Hard Drive Activity LED Header Pins 1 and 3 can be connected to an LED to provide a visual indicator that data is being read from or written to a hard drive. 2.2.2.4.2 Reset Switch Header Pins 5 and 7 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. 2.2.2.4.3 Power/Sleep LED Header Pins 2 and 4 can be connected to a single-or dual-color LED. Table 20 shows the default states for a single-color LED. Table 20. States for a One-Color Power LED LED State Description Off Power off/hibernate (S5/S4) Blinking Sleeping (S3) Steady Green Running/Away (S0) NOTE The LED states listed in Table 20 are default settings that can be modified through BIOS setup. Systems built with a dual-color front panel power LED can also use alternate color state options. 2.2.2.4.4 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 circuitry 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 circuitry will recognize another on/off signal. Technical Reference 2.2.2.5 Front Panel USB Headers Figure 13 and Figure 14 are connection diagrams for the front panel USB headers. NOTE • The +5 VDC 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 13. Connection Diagram for Front Pan...