Emerson / Motorola MVME167-03 Single-Board Computer

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 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.