VMEbus


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VMEbus

A widely accepted backplane interconnection bus system developed by a consortium of companies led by Motorola, now standardised as IEEE 1014.

VMEbus

(VersaModule Eurocard BUS) An expansion bus technology developed by Motorola, Signetics, Mostek and Thompson CSF in the early 1980s. It is defined by the ANSI/IEEE 1014-1987 standard. Supporting up to 21 cards in a single backplane, VMEbus is widely used in industrial, telecommunications and military applications with products available from several hundred manufacturers worldwide. VMEbus cards (VME cards) come in 3U, 6U and 9U Eurocard formats (see Eurocard).

In 1995, VME64 was introduced, which increased the data and addressing paths from 32 to 64 bits and added several enhancements. However, VME boards can be VME64 compliant and provide less than 64 bits of data transfer and/or addressing. In 1997, VME64x (VME64 eXtensions) added features such as new pin connections, support for 3.3 volts and hot swap capability. See VXI, VITA and PMC.
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One example is a PowerPC family of CPU boards that is fast enough (up to 800 MHz, increasing to 1.2 GHz in 2004) for real-time applications, yet does not need many fans to cool the CPU (6W as compared to 30W-90W for a state-of-the-art Intel CPU--quite a difference.) PowerPC-based VMEbus CPU boards of the IBM 750 FX/750 GX family are also significantly faster than PowerPC microcontrollers, available with up to 300 MHz (increasing to 550 MHz in 2004).
-- Tsi148 PCI-X bus to VMEbus bridge with 2eSST protocol for 320MB/s transfer rate across standard VMEbus
The prime objective of VMEbus is to insure interoperability among vendors.
The new area computers--18 VMEbus multiprocessor systems--handle the bulk of the real-time traffic control, each managing 576 intersections within a geographic region.
For example, VMEbus, now 20 years old, has enjoyed a wide acceptance in the medical market, providing complete compute solutions for modalities and laser imagers.
It has a master/slave PCI-to-VME64 bridge on board that enables it to function in multiprocessing applications on the VMEbus. Its CPU is the 400-MHz MPC8245 Kahlua II PowerPC processor.
In addition to Gigabit speeds the adapter can automatically interface with legacy 10/100 Mb/second networks when used in VMEbus, CompactPCI or PCI systems.
Xycom, Inc., headquartered in Saline, Michigan, is a worldwide leader in the industrial computer market with a broad product offering including hardened personal computers, industrial workstations for the plant floor, human/machine interface software, and VMEbus board-level computer products.
But how about VXIbus - VMEbus eXtention for Instrumentation?
For example, the decommutator board uses the standard VME and VMEbus subsystem bus (VSB) interfaces for the movement of information.
Their cX platforms are designed for real-time distributed computing and have distributed architectures for 3-, 10-, 12-, and 20-slot VMEbus boards.