MOTOROLA MVME335: MC68030 VMEbus Computer Board
The MOTOROLA MVME335 is a compact, cost-optimized single board computer in the 6U VMEbus form factor, built around the MC68030 microprocessor. It offers a reliable, integrated solution with onboard memory, serial communication, and timer functions, serving as a dedicated controller or processor module in industrial control, instrumentation, and embedded systems where a balance of performance and simplicity is key.
Efficient Computing Core for Embedded Control
The MOTOROLA MVME335 is designed as an efficient and practical computing engine within the VMEbus ecosystem. It provides a complete, integrated processor module that simplifies system design by consolidating CPU, memory, and basic I/O on a single 6U card. Based on the proven MC68030 32-bit microprocessor, this board delivers sufficient performance for a wide range of monitoring, control, and data processing tasks. Its value proposition lies in offering a reliable, self-contained VMEbus solution for applications that do not require the extensive expansion or highest performance of larger SBCs, making it ideal for dedicated functional roles within a multi-board chassis or as a standalone controller.
Board Architecture and Integrated Components
The MVME335 centers on the MC68030 CPU, which features an integrated Memory Management Unit (MMU) and data cache. The board's architecture is streamlined, focusing on core functionality. It incorporates both dynamic RAM (DRAM) for program execution and static RAM (SRAM) or EPROM for firmware and non-volatile storage, often accessible via a dedicated memory mezzanine site. Key to its operation is the VMEbus interface circuitry, allowing it to act as a master or slave on the backplane. The board includes essential onboard peripherals such as serial communication interfaces and timer/counter units, reducing the need for additional I/O cards in many applications.
MC68030 Microprocessor: A full 32-bit CPU with integrated MMU and 256-byte data cache, providing efficient processing for real-time control applications.
Onboard Memory System: Combines DRAM for main memory with EPROM/Flash and battery-backed SRAM for firmware, boot code, and critical data storage.
Dual Serial Communication Channels: Features two RS-232 serial ports (DUART) for console access, device interfacing, or system diagnostics.
VMEbus Interface: Provides a full VMEbus master/slave interface, supporting A24/A16 addressing and D16/D08 data transfers for system integration.
Compact 6U Design: Utilizes the standard 6U VME form factor, ensuring mechanical compatibility with industry-standard card cages and chassis.
Technical Specifications and Operational Details
The MVME335 is typically configured with an MC68030 processor running at a standard clock frequency (e.g., 25 MHz). Memory configurations vary but often include a base amount of DRAM (e.g., 1MB or 4MB) expandable via the onboard mezzanine site, along with EPROM sockets for firmware. The board's two serial ports operate as standard asynchronous RS-232 channels. It includes a system controller gate array to manage VMEbus functions like interrupt handling and bus arbitration. Power consumption is relatively low, adhering to the standard VMEbus power supply requirements. The board is designed for reliable operation in standard commercial or controlled industrial environments.
Target Applications and System Roles
The MOTOROLA MVME335 finds its niche in applications requiring a dependable, no-frills processor module. It is commonly used as a dedicated communication processor or protocol converter within larger VME systems, handling specific I/O tasks. In industrial settings, it can serve as a localized machine controller, data logger, or front-end processor for sensor networks. Its simplicity also makes it suitable for instrumentation systems, test equipment controllers, and as an intelligent peripheral controller offloading tasks from a central host CPU. It is an excellent choice for cost-sensitive projects or for adding distributed intelligence within a VME rack.
Advantages for System Designers
Integrating the MVME335 offers distinct benefits for system architecture. Its integrated design reduces component count and system complexity, leading to higher overall reliability and easier maintenance. The use of the mature MC68030 architecture ensures robust software support from various real-time operating systems and development tools, simplifying software development. For system designers, it provides a known, reliable building block that can be deployed quickly without the overhead of configuring a more complex SBC. Its role as a secondary or specialized processor can help optimize the performance of a main system CPU by handling dedicated, time-consuming tasks.
Conclusion
The MOTOROLA MVME335 embedded computer board exemplifies practical, focused engineering within the VMEbus standard. It delivers essential computing functionality in a reliable and compact package, addressing the needs of numerous embedded control and processing applications. For system integrators and engineers seeking a straightforward, cost-effective processor module for industrial control, data acquisition, or dedicated processing tasks, the MVME335 remains a viable and trusted solution. It underscores the enduring utility of the VMEbus architecture and Motorola's 68000 family in providing stable, long-lifecycle platforms for embedded systems across diverse industries.
