The Emerson/Motorola MVME162-412 is a VMEbus-based embedded controller for real-time industrial automation and control systems. This single-board computer delivers 32-bit processing with configurable processor options, integrated memory management, and high-performance DMA capabilities. The MVME162-412 operates as both VMEbus master and slave with system controller functionality, supporting A32/D64 data transfers and versatile serial communication interfaces for demanding embedded applications.
## Technical Specifications
**Processor and Core Architecture**
• MC68LC040 or MC68040 microprocessor options at 25 MHz or 32 MHz
• 8 KB on-board cache with integrated Memory Management Unit (MMU)
• Floating Point Unit (FPU) integrated on MC68040 variants
• Single non-interleaved SRAM architecture
**Memory Configuration**
• 4 MB shared DRAM with parity protection or ECC support
• 512 KB SRAM with battery backup
• 1 MB Flash memory for firmware storage
• 8K × 8 NVRAM and Time-of-Day (TOD) clock with battery backup (200-day worst-case retention)
• One 32-pin PLCC EPROM socket
**VMEbus Interface**
• VMEchip2 ASIC controller with A32/D64 master/slave capability
• System controller functionality
• High-performance DMA support for D64 and local bus memory burst cycles
• DMA transfers: D16/D32/D64/BLT (VMEbus to local bus); D8/D16/D32 (processor to VMEbus)
• Four-level requester, seven-level interrupter, seven-level interrupt handler
• Eight software-programmable hardware interrupts via VMEchip2
**Serial Communication**
• Two serial ports: console (EIA-232-D DTE) and user-configurable (EIA-232-D or EIA-422 V.36)
• Additional ports configurable as EIA-232-D
## Key Features
• Selectable processor performance: 25 MHz LC040 or 25/32 MHz 68040 variants
• Integrated floating-point processing on 68040 models
• Multiple I/O configuration options for serial communication
• Battery-backed memory for persistent data retention
• Expandable DRAM architecture on select variants
## Typical Applications
• Real-time control systems and process automation
• Industrial data acquisition and monitoring
• VMEbus-based distributed control architectures
• Embedded systems requiring deterministic processing
## Compatibility & Integration
The MVME162-412 integrates directly into VMEbus backplanes supporting A32/D64 protocols. Serial ports support standard EIA-232-D and EIA-422 interfaces for host communication. On-board NVRAM and clock enable autonomous operation independent of external time sources.
