The Emerson/Motorola MVME167-33 is a 6U single-height VMEbus single-board computer built around the Motorola MC68040 microprocessor. Operating at 33 MHz, it delivers up to 40 MIPS and integrates an 8 KB L1 cache, Memory Management Unit, and Floating-Point Unit for real-time control, data acquisition, and embedded computation in industrial systems.
## Technical Specifications
**Processor & Memory**
• Motorola MC68040 microprocessor at 33 MHz
• On-chip cache: 8 KB L1 (4 KB instruction, 4 KB data)
• Built-in MMU and FPU
• Performance: Up to 40 MIPS at 33 MHz
• DRAM: 16 MB ECC (MVME167-33B/033B models); configurable 4–128 MB with four-way interleaving
• ROM/EPROM: Four 44-pin sockets supporting up to 4 MB
• SRAM: 128 KB with optional battery backup
• NVRAM: 8 KB with real-time clock/calendar (MK48T08)
**Bus & Interfaces**
• Full 32-bit VMEbus master/slave (IEEE 1014 compliant) with D64 support via VMEchip2 ASIC
• 32-bit local bus DMA for VMEbus D64 and memory burst cycles
• On-board SCSI interface with 32-bit burst DMA
• On-board Ethernet interface with 32-bit DMA
• Four EIA-232-D serial ports (CD2401 quad processor) at 38.4K bps maximum
• 8-bit bidirectional Centronics-compatible parallel port
• P2-VME connector for external I/O and transition modules (MVME712 Series)
**Timers & Control**
• Four 32-bit programmable timers with 1 msec resolution
• One watchdog timer
• Remote reset/abort/status functions
• Status LEDs: FAIL, STAT, RUN, SCON, LAN, +12V, SCSI, VME
• On-board RESET and ABORT switches
**Physical**
• Form factor: 6U VME single-height board
• Dimensions: 233.35 mm H × 160.00 mm D × 16.77 mm thickness (with mezzanine)
## Key Features
• MMU and FPU integrated for advanced computational workloads
• Configurable memory from 4 MB to 128 MB with ECC support
• Four-way interleaved DRAM for high-bandwidth access
• Dual interface capability: VMEbus D64 and local DMA burst
• Multiple serial, parallel, SCSI, and Ethernet connectivity options
• Real-time clock and NVRAM for persistent timekeeping
## Typical Applications
• Industrial process control and monitoring
• Real-time data acquisition systems
• Embedded system gateways and controllers
• VMEbus instrumentation platforms
## Compatibility & Integration
Full VMEbus compliance enables integration into legacy and modern VME systems. Transition modules extend I/O options via the P2-VME connector. Memory configurations support both parity and ECC modes for reliability-critical deployments.
