VME BUS

VME Bus Introduction
Since its introduction in 1981, the VME Bus has been a very popular protocol in the computer industry. That is because the VME Bus is a flexible open-ended bus system.

VME Bus Uses
The VME Bus is used in a wide variety of applications. In many cases, the VME Bus 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.

The VME Bus Architecture
The VME Bus uses a VME Bus master-slave architecture. Functional modules called VME Bus masters transfer data to and from functional VME modules called VME Bus slaves. Since many masters may reside on the VME Bus, it is called a multiprocessing VME Bus. Before a master transfers data, it must first acquire the VME Bus using a central arbiter. The VME Bus arbiter is part of a module called the VME Bus system controller. The VME Bus system controller's function is to determine which VME Bus master gets access to the VME Bus. All VME Bus 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.

Symmetricom's VME Bus 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.