Abaco Systems / VMIC VMIVME-DR11W High-Performance DR11W Interface

The Abaco Systems / VMIC VMIVME-DR11W is a high-performance DR11W interface board for VMEbus systems. It enables bidirectional, half-duplex data exchange between VMEbus architecture and external DR11W protocol devices, supporting both 16-bit and 32-bit transfers across a 32-bit addressing range. Built around the SCB68430 DMA controller and MC68153 Bus Interrupter Module (BIM), the board delivers deterministic interrupt handling with fully programmable vectors, levels, and VMEbus address modifiers. A front panel fail LED provides operational status visibility.

– Technical Specifications

Interface & Addressing
• DR11W parallel interface protocol
• VMEbus compliance: ANSI/IEEE STD 1014-1987, IEC 821, IEC 297
• A24/A32 master and A16/A24 slave addressing modes
• 32-bit addressing range

Data Transfer
• 16-bit and 32-bit data transfers
• Bidirectional, half-duplex operation
• VME-to-VME burst rate: 1.8 Mbytes/s (32-bit, 10 ft cables)
• VME-to-VME single cycle: 1.1 Mbytes/s (32-bit, 10 ft cables)
• Q-Bus burst rate: 1.0 Mbyte/s
• Q-Bus single cycle: 0.5 Mbyte/s
• Maximum block size: 256 Kbytes minus 4 bytes
• Bus grant delay: 70 ns (master operation)

Interrupts & Control
• Fully programmable interrupt vectors and levels
• MC68153 BIM for VMEbus interrupt management
• Attention interrupt generation to external devices

– Key Features

• Double Eurocard form factor (6U), 160 mm × 233.4 mm × 12.5 mm
• Convection cooling; typical power consumption 4.5 A at +5 VDC
• Two 40-conductor shielded flat-ribbon cable interfaces
• Operating temperature range: 0 to 55 °C
• Storage temperature range: -20 to 85 °C
• Humidity rating: 20% to 80% non-condensing

– Typical Applications

Industrial data acquisition systems, high-speed VMEbus interconnects, legacy DEC device integration, and multi-board DMA transfers requiring deterministic interrupt response.

– Compatibility & Integration

Interfaces with Digital Equipment Corporation DR11-W and DRV11-WA devices and DR11-W CPU links. Back-to-back configuration of two VMIVME-DR11W boards creates VMEbus-to-VMEbus DMA links. Full VMEbus specification compliance ensures integration with standard 6U crate architectures.