Intel Desktop Board DX79TO Product Guide
50
USB 2.0 Headers
Figure 20, E shows the location of the USB 2.0 headers. Table 11 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 11. 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 20, G shows the location of the front panel header. Table 12 shows the pin
assignments and signal names for the front panel header.
Table 12. 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
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