Intel DX79SI Product Guide for Intel Desktop Board DX79SI - Page 53

USB 2.0 Headers, Front Panel Header, Table 13. USB 2.0 Header Signal Names

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Installing and Replacing Desktop Board Components USB 2.0 Headers Figure 22, G shows the location of the USB 2.0 headers. Table 13 shows the pin assignments and signal names for each USB 2.0 header. Each USB header can be used to connect two USB devices. Table 13. USB 2.0 Header Signal Names USB Port A Pin Signal Name Pin 1 Power (+5 V) 2 3 D- 4 5 D+ 6 7 Ground 8 9 Key 10 USB Port B Signal Name Power (+5 V) DD+ Ground No Connection NOTE Computer systems that have an unshielded cable attached to a USB port might not meet FCC Class B requirements, even if no device or a low-speed USB device is attached to the cable. Use a shielded cable that meets the requirements for a full-speed USB device. Front Panel Header Figure 22, I shows the location of the front panel header. Table 14 shows the pin assignments and signal names for the front panel header. Table 14. Front Panel Header Signal Names Pin Description In/Out Pin Description Hard Drive Activity LED Power LED 1 Hard disk LED pull-up to +5 V Out 3 Hard disk active LED Out 2 Front panel green LED 4 Front panel yellow LED Reset Switch On/Off Switch 5 Ground 6 Power switch 7 Reset switch In 8 Ground Power Not Connected 9 Power Out 10 No pin In/Out Out Out In 53

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Installing and Replacing Desktop Board Components
53
USB 2.0 Headers
Figure 22, G shows the location of the USB 2.0 headers.
Table 13 shows the pin
assignments and signal names for each USB 2.0 header.
Each USB header can be
used to connect two USB devices.
Table 13. USB 2.0 Header Signal Names
USB Port A
USB Port B
Pin
Signal Name
Pin
Signal Name
1
Power (+5 V)
2
Power (+5 V)
3
D-
4
D-
5
D+
6
D+
7
Ground
8
Ground
9
Key
10
No Connection
NOTE
Computer systems that have an unshielded cable attached to a USB port might not
meet FCC Class B requirements, even if no device or a low-speed USB device is
attached to the cable.
Use a shielded cable that meets the requirements for a
full-speed USB device.
Front Panel Header
Figure 22, I shows the location of the front panel header.
Table 14 shows the pin
assignments and signal names for the front panel header.
Table 14. Front Panel Header Signal Names
Pin
Description
In/Out Pin Description
In/Out
Hard Drive Activity LED
Power LED
1
Hard disk LED pull-up to +5 V Out
2
Front panel green LED
Out
3
Hard disk active LED
Out
4
Front panel yellow LED
Out
Reset Switch
On/Off Switch
5
Ground
6
Power switch
In
7
Reset switch
In
8
Ground
Power
Not Connected
9
Power
Out
10
No pin