The Emerson/Motorola MVME167-32 is a VMEbus-based single-board computer built around the Motorola MC68040 microprocessor for real-time control, data acquisition, and communication in industrial environments. Available in 25 MHz and 33 MHz variants, the board delivers 27.7 MIPS and 36.8 MIPS respectively, combining integrated MMU and FPU with configurable memory up to 256 MB DRAM/ECC and comprehensive I/O interfaces including SCSI, four serial ports, Ethernet, and parallel port connectivity.
## Technical Specifications
**Processor**
• Motorola MC68040 with integrated MMU and FPU
• 25 MHz (-00X) and 33 MHz (-03X) models
• 8 KB on-chip L1 cache (4 KB instruction, 4 KB data)
• Performance: 27.7 MIPS @ 25 MHz; 36.8 MIPS @ 33 MHz
**Memory Configuration**
• DRAM: 4, 8, 16, 32, 64, 128, or 256 MB with ECC; or 4, 8, 16, 32, or 64 MB with parity
• Four-way interleaved DRAM; software-selectable base address
• SRAM: 128 KB with optional battery backup
• NVRAM: 8 KB with battery-backed real-time clock/calendar
• ROM: Four 44-pin PLCC sockets (up to 4 MB on-board)
**VMEbus Interface**
• Full 32-bit Master/Slave (A16/A24/A32, D8/D16/D32/D64)
• VME D64 specification support
• System controller functions; local bus to VMEbus DMA controller
• Interrupter and interrupt handler capabilities
• Global Control and Status Register (GCSR)
**I/O Interfaces**
• SCSI with 32-bit local bus burst DMA
• Four serial ports (EIA-232-D) with DMA support
• Ethernet transceiver with DMA support
• One 8-bit bidirectional Centronics-compatible parallel port
**Control & Monitoring**
• Four 32-bit tick timers; one watchdog timer
• Remote Reset/Abort/Status control; on-board switches
• Status LEDs: FAIL, STAT, RUN, SCON, LAN, +12V (LAN), SCSI, VME
## Key Features
• M68000 family software compatibility with near-RISC performance
• Flexible memory configurations supporting both parity and ECC protection
• High-performance DMA architecture for efficient data transfers
• Multi-port serial and network connectivity for distributed systems
• Integrated timers and watchdog monitoring for mission-critical applications
## Typical Applications
• Industrial process control and automation
• Real-time data acquisition systems
• VME-based instrumentation and test platforms
• Embedded communications gateways
• Harsh-environment monitoring and logging
## Compatibility & Integration
The MVME167-32 integrates into VME chassis environments. Its 32-bit VMEbus Master/Slave architecture supports standard A16/A24/A32 and D8/D16/D32/D64 protocols, while DMA capabilities across SCSI, serial, and Ethernet subsystems minimize processor overhead. Existing M68000 software libraries port directly to the MC68040 architecture.
