Emerson / Motorola MVME147A-1 25 MHz, 8MB 2-Slot Single Board Computer

The Emerson/Motorola MVME147A-1 is a single-height 6U VMEbus single-board computer delivering 32-bit processing at 25 MHz for industrial control, real-time embedded, and data acquisition systems. Built around the Motorola MC68030 enhanced microprocessor with on-chip cache and supported by an optional MC68882 floating-point coprocessor, this module integrates 8 MB of DRAM, 4K×8 SRAM, and battery-backed time-of-day clock functionality on a single compact board. The MVME147A-1 reduces external module count through on-board Ethernet (AMD AM7990 Lance 10Mb MAC), SCSI (WD33C93B narrow SE controller), four EIA-232-D serial ports, one 8-bit parallel interface, I2C, and SPI support. VMEbus system control capabilities - including arbiter (round-robin/priority selectable), global time-out timer, and System Controller functionality via jumperable configuration - enable flexible integration into larger VME architectures. Diagnostic firmware and dual 16-bit timers plus watchdog timer provide essential embedded system supervision.

Technical Specifications Processor & Memory

Motorola MC68030 32-bit microprocessor @ 25 MHz

MC68882 floating-point coprocessor support (16, 25, or 33.33 MHz)

8 MB DRAM

4K×8 SRAM

Four 28/32-pin ROM/PROM/EPROM/EEPROM sockets

MK48T02 non-volatile RAM with integrated clock VMEbus Interface

ANSI/VITA 1-1994 VME64 (IEEE STD 1014) compliant

VMEchip ASIC-based VMEbus controller with System Controller and Arbiter modes

Global time-out timer Communications & Networking

Four EIA-232-D serial ports (85C30 controller)

10 Mb Ethernet MAC (AMD AM7990 Lance) with Intel LXT901 SIA

WD33C93B narrow SCSI bus controller

One 8-bit Centronics-compatible parallel port (PCC ASIC)

I2C and SPI bus support Peripherals

Two 16-bit timers/counters

Watchdog timer

Battery-backed time-of-day clock

On-board diagnostic firmware

PCCchip and GCCchip ASICs for integrated control Physical

Single-height 6U form factor

233.4 mm H × 160.0 mm D × 19.8 mm W

Operating temperature: 0°C to 55°C (forced air cooling)

Key Features

MC68030 on-chip cache enhances instruction throughput and reduces external memory bandwidth requirements

Integrated Ethernet and SCSI eliminate dedicated expansion modules

Four serial ports support legacy industrial protocols and multi-device configurations

VMEchip ASIC reduces discrete logic and improves reliability

Jumperable System Controller role enables deployment as primary or secondary node

Non-volatile RAM with clock backs up critical timing and parameter data across power cycles

Typical Applications

Real-time process control and instrumentation

Industrial embedded systems requiring 10 Mb networking

VME-based test equipment and data loggers

Systems demanding legacy serial and modern Ethernet coexistence

Compatibility & Integration The MVME147A-1 runs VxWorks, LynxOS, OS-9, VRTX-32, pSOS+, and Motorola System V/68. Optional MVME712M transition module enables standard I/O connections.