User`s manual

2.2 Alpha PCI 64–275 Board Connectors
Table 2–3 (Cont.) Module Connector Descriptions (See Figure 2–3)
Connector Pins Description
J29 6 Module power connector (GND, –5 V, +5 V)
Pin Voltage/Signal
1 Ground
2 Ground
3–5V
4+5V
5+5V
6+5V
J31 6 Module power connector (GND, +12 V, –12 V, +5 V,
p_dcok)
Pin Voltage/Signal
1 p_dcok
2+5V
3 +12 V
4 –12 V
5 Ground
6 Ground
Note: Power for the Alpha PCI 64–275 is provided by a
user-supplied, standard PC power supply that includes
3.3 Vdc. Digital does not provide this power supply.
J14 3 CPU fan power and sensor. Pin 1 is +12 V. Pin 2 is
sensor; low = fan on. Pine 3 is ground.
Caution: Fan sensor required
The fan must have a built-in sensor that drives a signal
if the airflow stops. The sensor is connected to J14.
The fan supplied with the Alpha PCI 64–275 includes
an airflow sensor.
(continued on next page)
2–12 Board Jumpers and Connectors