The Motorola MVME-147A is a high-performance single board computer designed for industrial and embedded computing applications, featuring a compact 2-slot form factor and 8MB of memory to deliver reliable processing capabilities. It integrates the MVME147 MPU VMEmodule with a built-in Small Computer Systems Interface (SCSI) bus port, powered by the WD33C93 SCSI interface controller, enabling seamless connectivity with a wide range of SCSI devices. The board supports both initiator and target roles in SCSI operations, coupled with flexible firmware that simplifies command execution and accelerates software development cycles, making it suitable for demanding industrial control, data acquisition, and embedded processing scenarios.
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Core Technical Specifications
Processor & Memory: Equipped with a high-performance MPU (Microprocessor Unit) optimized for VMEbus architecture, paired with 8MB of memory that provides sufficient space for program execution and data storage, ensuring smooth operation of complex embedded applications.
Bus & Interfaces: Features an industry-standard compliant VMEbus interface for seamless integration into VME-based systems. The integrated SCSI bus port supports the SCSI protocol via the WD33C93 controller, enabling high-speed data transfer with SCSI devices such as hard disks, tape drives, and optical storage.
Firmware & Functions: Comes with built-in SCSI firmware stored in two 128K x 8 EPROMs, coexisting with the MVME147Bug debug monitor. The firmware supports up to 64 concurrent peripheral devices, offering interrupt mode for real-time applications, polled mode for non-interrupt operations, and DMA with memory scatter/gather functionality.
Expansion & Compatibility: Adopts a 2-slot design facilitating easy expansion with additional VMEbus modules, enhancing functional versatility. It supports a broad range of SCSI devices including Winchester disks, floppy drives, and streaming tape drives from manufacturers such as Seagate, Micropolis, and Archive, adhering to Common Command Set (CCS) standards for wide-ranging compatibility.
Operating Modes & Reliability: Supports multitasking in target role for devices handling arbitration and reselection, with six firmware entry points enabling flexible command execution. Engineered for industrial-grade reliability, the board operates stably in harsh environments and supports both synchronous and asynchronous SCSI transfers for versatile data processing.
Key Technical Advantages
SCSI Function Optimization: Customized SCSI sequence packets empower users to develop tailored functions without firmware rewriting, supporting linked commands and complex data transfer scenarios. The firmware’s high-level command interface eliminates the need for direct SCSI bus protocol management, significantly reducing system development cycles.
Dual Operation Modes: Interrupt mode enhances processor efficiency by freeing up the CPU during bus idle periods, while polled mode is specifically designed for interrupt-intolerant applications. This dual-mode architecture ensures adaptability to diverse system requirements across industrial automation scenarios.
Robust Hardware Integration: Equipped with the WD33C93 SCSI controller, the board guarantees reliable data transmission through built-in parity checking. Its compliance with VMEbus standards enables seamless integration into existing industrial control systems, supporting modular expansion to accommodate evolving application demands.
Comprehensive Device Compatibility: Explicitly supports a broad portfolio of SCSI controllers and drives, including Seagate WREN series disks, Micropolis 1375 hard drives, and Archive Viper tape drives. The product provides detailed controller type assignments and flexible configuration options, facilitating quick and hassle-free setup for end-users.
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