VMEbus

The VMEbus Architecture
The VMEbus uses a master-slave architecture. Functional modules called VMEbus masters transfer data to and from functional modules called slaves. Since many masters may reside on the VMEbus, VMEbus is called a multiprocessing VMEbus. Before a VMEbus master transfers data, the master must first acquire the VMEbus using a VMEbus central arbiter. The arbiter is part of a module called the VMEbus system controller. The VMEbus system controller's function is to determine which VMEbus master gets access to the VMEbus. All VMEbus activity takes place on five VME sub-buses. The VME sub-buses are called the VME Data Transfer Bus, the VME Data Transfer Arbitration Bus, the VME Priority Interrupt Bus, the VME Utility bus and the VME Serial Bus.

VMEbus Uses
The VMEbus is used in a wide variety of applications. In many cases, the VMEbus system design has been tailored to support specialized applications, especially in rugged environments. Some of the most popular VME applications include the Military; Aerospace; Transportation; Telecom; Simulation; Test & Measurement; Industrial Controls; Medical; High Energy Physics; and general business.

Symmetricom's VMEbus Modules

• Symmetricom's VME/VXI Bus boards are compatible with 6U high systems.
• Symmetricom's VME/VXI boards support applications in rugged environments.
• Symmetricom's VME/VXI product offerings include a ruggedized configuration specifically tailored to support rugged, high vibration environments.
• Symmetricom's VME/VXI Bus boards provide precision time and frequency reference to the host computer and peripheral data acquisition systems. Time is acquired from either the GPS satellites or using supplied signals, typically IRIG B.