Installing and Replacing Desktop Board Components
IEEE 1394a Header
Figure 27, F shows the location of the IEEE 1394a header. Table 9 shows the pin assignments and signal names for the IEEE 1394a header.
Table 9. IEEE 1394a Header Signal Names
Pin | Signal Name |
|
|
1 | TPA1+ |
3 | Ground |
|
|
5 | TPA2+ |
|
|
7 | +12 V |
|
|
9 | Key (no pin) |
|
|
Pin | Signal Name |
|
|
2 | TPA1- |
4 | Ground |
|
|
6 | TPA2- |
|
|
8+12 V
10Ground
USB 2.0 Headers
Figure 27, G shows the location of the USB 2.0 headers. Table 10 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 10. USB 2.0 Header Signal Names
| USB Port A |
|
|
Pin | Signal Name |
1 | Power (+5 V) |
3 | D- |
5 | D+ |
7Ground
9Key
| USB Port B |
Pin | Signal Name |
2 | Power (+5 V) |
4 | D- |
6 | D+ |
8 | Ground |
10 | No Connection |
Note: USB ports may be assigned as needed.
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
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