Front Panel I/O Connectivity Design Guide

2.2.5 Pin Assignments

The following two tables list the pins for the IR and Switch/LED headers. To support a legacy

2x8-pin connector to connect to both headers, see Note 3 following Table 5.

Table 4. IR Front Panel Electrical Connection

Pin Signal Description Pin Signal Description

1 IRRX2 IrDA serial input 2 GND Ground

3 GND Ground 4 (No pin) Key

5 IRTX2 IrDA serial output 6 +5 V IR power

Table 5. Switch/LED Front Panel Electrical Connection

Pin Signal Description

1 HD_LED_P

Hard disk LED pullup (330 Ω) to +5 V

2 FP PWR/SLP

MSG LED pull-up (330 Ω) to +5 V Standby

Note 1

3 HD_LED_N Hard disk active LED

4 FP PWR/SLP

MSG LED pull-up (330 Ω) to +5 V Standby

5 RST_SW_N Reset switch tied to GND

6 PWR_SW_P

Power switch high reference pull-up (2.2 kΩ) to +3.3 V Standby

Note 2

7 RST_SW_P

Reset switch high reference pull-up (1 kΩ to voltage appropriate for the

motherboard circuit, such as, +3.3 V for the ICH bridge)

8 PWR_SW_N Power switch tied to GND

9 RSVD_DNU

Reserved

Note 3

Notes:

1. Standby voltage is the voltage that is active during a sleep state that your board supports.

2. If you want to tie this pin to +5 V Standby, adjust the pull-up resistor size (to 10 kΩ, for example).

3. If you want to support the legacy 2x8 connector, place a 0 ohm shorting resistor between pin 9 and +5 V.