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.
