The Emerson/Motorola MVME167-03 is a VMEbus-based single-board computer built on the Motorola MC68040 microprocessor for real-time control, data acquisition, and industrial communication tasks. This 25 MHz variant delivers 26 MIPS and 3.5 MFLOPS with integrated MMU and FPU, backed by configurable DRAM ranging from 4 MB to 64 MB with parity protection. The board integrates four serial ports (up to 38.4K bps asynchronous), Ethernet with 32-bit DMA, narrow SE SCSI interface, and a parallel port, making it suitable for demanding embedded and industrial applications requiring deterministic performance and extensive I/O capability.
## Technical Specifications
**Processor**
• Motorola MC68040 operating at 25 MHz
• Performance: 26 MIPS, 3.5 MFLOPS
• Integrated MMU and FPU
• 8 KB on-chip L1 cache (4 KB Instruction, 4 KB Data)
**Memory**
• On-board DRAM: 4 MB to 64 MB, four-way interleaved with parity checking
• DRAM timing: 2/3/0 wait states (read no parity/read parity/write)
• Read burst: 4-1-1-1; Write burst: 2-1-1-1
• 128 KB on-board SRAM with optional battery backup
• 8 KB NVRAM with real-time clock/calendar and battery backup
• Four 44-pin ROM/EPROM sockets supporting up to 4 MB
**VMEbus Interface**
• Full 32-bit master/slave compliance with IEEE 1014
• Support for VME D64, BLT, and MBLT data transfers
• A16, A24, A32 addressing modes
• VMEchip2 ASIC providing DMA, system controller, interrupter, and interrupt handler functions
**I/O Interfaces**
• Four EIA-232-D serial ports: up to 38.4K bps asynchronous, 64K bps synchronous maximum
• One 8-bit bidirectional Centronics-compatible parallel port
• On-board Ethernet with 32-bit local bus DMA (Intel i82596CA controller)
• On-board SCSI with 32-bit local bus burst DMA (NCR53C710 narrow SE controller)
• Four 32-bit timers with 1 msec resolution and one watchdog timer
• Status LEDs: FAIL, STAT, RUN, SCON, LAN, +12V (LAN power), SCSI, VME
## Key Features
• Parity-protected DRAM for data integrity in mission-critical environments
• VMEbus system controller capability for multiboard configurations
• Four independent serial channels for flexible serial communications
• Integrated Ethernet and SCSI controllers with dedicated DMA
• Battery-backed SRAM and NVRAM for persistent storage and timekeeping
• Multiple addressing modes for large system memory spaces
## Typical Applications
• Industrial automation and real-time process control
• Data acquisition and signal processing
• VME chassis-based embedded systems
• Telecommunications and networking equipment
• Test and measurement instrumentation
## Compatibility & Integration
The MVME167-03 integrates directly into standard VMEbus backplanes and supports IEEE 1014 master/slave operations. Ethernet and SCSI interfaces enable seamless connection to networked and storage peripherals. Quad serial I/O enables legacy device communication alongside modern connectivity options.
