Technical data
Table Of Contents
- Technical Reference Manual for OEMs HP Models 743, 744, and 748
- Contents
- 1 General Information
- Model 743 and Model 744 VME Board Computers
- Product Description
- Supported Configurations
- Model 743 and Model 744 External Devices
- Keyboard and Mouse
- Model 743 and Model 744 Cables
- Model 743 and Model 744 Functional Description
- Model 744 Block Diagram
- CPU Circuit
- Boot ROM Circuit
- Graphics Circuit
- Model 743 Memory Controller Circuit
- Model 744 Memory Controller Circuit
- LED Displays
- I/O Controller ASIC
- VME Controller ASIC
- I/O Expansion
- I/O Expansion Block Diagrams
- Model 748 Ruggedized Workstation
- Model 743 and Model 744 VME Board Computers
- 2 References
- 3 Quality
- 4 Mechanical Information
- 5 Electrical Information
- Video Connector Pinouts
- Audio Connector Pinouts
- HP Parallel Connector Pinouts
- RS-232 Connector Pinouts
- AUI LAN Connector Pinouts
- Single-Ended SCSI Connector Pinouts
- FW SCSI Connector Pinout
- PS/2 Connector Pinouts
- VME Connector Pinouts
- Real-Time Clock (RTC) Battery Information
- Video Output Signal Specifications
- Video Timing Specifications
- 6 Power Requirements
- 7 Product Design Considerations
- Index
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
C
onnector