Intel DX79TO Technical Product Specification - Page 49
Processor, Front and Rear Chassis, and Auxiliary
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Technical Reference Table 15. IEEE 1394a Header Pin Signal Name 1 Data A (positive) 3 Ground 5 Data B (positive) 7 +12 V DC 9 Key (no pin) Pin 2 4 6 8 10 Signal Name Data A (negative) Ground Data B (negative) +12 V DC Ground Table 16. SATA Connectors Pin Signal Name 1 Ground 2 TXP 3 TXN 4 Ground 5 RXN 6 RXP 7 Ground Table 17. USB 2.0 Headers Pin Signal Name 1 +5 V DC 2 D− 3 D+ 4 Ground 5 Key (no pin) Table 18. Chassis Intrusion Header Pin Signal Name 1 Intruder# 2 Ground Table 19. Processor, Front and Rear Chassis, and Auxiliary (4-Pin) Fan Headers Pin Signal Name 1 Ground (Note) 2 +12 V 3 FAN_TACH 4 FAN_CONTROL Note: These fan headers use Pulse Width Modulation control for fan speed. 49
Technical Reference
49
Table 15.
IEEE 1394a Header
Pin
Signal Name
Pin
Signal Name
1
Data A (positive)
2
Data A (negative)
3
Ground
4
Ground
5
Data B (positive)
6
Data B (negative)
7
+12 V DC
8
+12 V DC
9
Key (no pin)
10
Ground
Table 16.
SATA Connectors
Pin
Signal Name
1
Ground
2
TXP
3
TXN
4
Ground
5
RXN
6
RXP
7
Ground
Table 17.
USB 2.0 Headers
Pin
Signal Name
1
+5 V DC
2
D−
3
D+
4
Ground
5
Key (no pin)
Table 18.
Chassis Intrusion Header
Pin
Signal Name
1
Intruder#
2
Ground
Table 19.
Processor, Front and Rear Chassis, and Auxiliary
(4-Pin) Fan Headers
Pin
Signal Name
1
Ground
(Note)
2
+12 V
3
FAN_TACH
4
FAN_CONTROL
Note:
These fan headers use Pulse Width Modulation control for fan speed.