6-2
Power Requirements
Power Distribution
Power Distribution
The VMEbus chassis connectors P1 and P2 distribute power to the Model 743 and Model
744 board computer’s PC boards as follows:
Graphics cards receive power through the adapter board’s P1 and P2 connectors. RAM cards
receive power through the RAM stack connectors. The system board and RAM card receive
power through the system board’s P1 and P2 connectors.
NOTE:
VME P1 and P2 connectors use two or more pins to carry power or grounds to the board
computer. Check the VME P1 and P2 pinout tables for exact pin identification for power and
grounds.
Figure 6-1 and Figure 6-2 illustrate the power distribution for the Model 743 and Model 744
VMEbus board computers. Figure 6-3 and Figure 6-4 illustrate the power distribution for the
GSC expansion adapter and the PMC adapters.
Figure 6-1
Model 743 Board Computer Power Distribution Diagram
+3.3
Regulator
P2
+5
GND
P1
GND
–12
+12
+5
GND
+3.3
+5
+12
–12
Thermal
Fuse
+12
AUI
+5
GND
RAM
Stack 1
+5
GND
RAM
Stack 2
Thermal
Fuse
Electrical
Resetable
Fuse
+5
+5
+5
GND
SCSI
Termination
Power
PS/2–1
PS/2–0
PCMCIA Connector
GSC Connector
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