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
5-39
Electrical Information
Table 5-32 summarizes the timing specifications for the 1024 x 768 and 1280 x 1024 moni-
tors at VESA 75 Hz standard.
In the past, Hewlett-Packard workstation timing was set with sync-on-green. The VESA
standard provides separate TTL syncs, thereby providing an unambiguous way for the moni-
tor to distinguish them.
Table 5-32 Timing Specifications for VESA 75 HZ Standard
Signal
D2806A
1024x768
75 Hz VESA
A4330A/A4331
1280x1024
75 Hz VESA
Horizontal active scan 13.003µs9.481µs
Horizontal “back porch” 2,235µs1.837µs
Horizontal blanking 3.367µs3.022µs
Horizontal “front porch” 0.203µs0.119µs
Horizontal period (“1H”) 16.660µs 12.504µs
Horizontal sweep frequency 60.023KHz 79.976KHz
Horizontal sync width 1.219µs1.067µs
Pixel clock rate 78.750 MHz 135.000Mhz
Vertical active period 12.795ms 12.804ms
Vertical “back porch” 466.48µs 475.15µs
Vertical blanking 0.533ms 0.525ms
Vertical frame rate 75.029Hz (non-in) 75.025Hz (non-in)
Vertical “front porch” 16.66µs (1H) 13.000µs (1H)
Vertical period 13.328ms 13.329ms
Vertical sync width 49.98 µs (3H) 37.520µs (3H)