The Curtiss-Wright/DY-4 SVME-739 is an intelligent serial communications controller engineered for demanding industrial and military environments. It delivers high-performance serial data handling through dual-processor architecture, combining a 16 MHz Motorola 68020 CPU with two 68302 Integrated Multiprotocol Processors. The SVME-739 supports six full-duplex serial channels with software-selectable EIA-422, EIA-423, and EIA-485 standards, making it suitable for multi-drop and party-line applications.
## Technical Specifications
**Processors & Memory**
• 16 MHz Motorola 68020 CPU with 512 KB SRAM (expandable to 2 MB)
• 256 KB Flash EPROM for the 68020 CPU (expandable to 512 KB)
• Two 68302 IMPs, each with 256 KB SRAM
• 512 bytes serial EEPROM for system configuration
**Serial Communications**
• Six full-duplex serial ports with software-selectable EIA-422/EIA-423
• Two channels selectable for EIA-485 multi-drop capability
• EIA-422 party-line mode support
• Programmable clock and handshaking line configuration
• Twelve DMA channels from the 68302 IMPs for serial data handling
• Two independent DMA channels for serial data memory movement
**Firmware & Protocols**
• Data Link Communication Suite (DLCS) firmware
• HDLC/SDLC™ synchronous protocol support
• Asynchronous operation capability
**Physical & Environmental**
• A64:D64 VMEbus interface per ANSI/VITA 1-1994 (VME64)
• Conduction cooling per IEEE 1101.2 (0.65-inch pitch)
• MIL-E-5400/4158 and MIL-STD-2036 qualified
• Ruggedization levels 0–3 available (SVME-739); levels 2–3 for DMV-739
• DMV-739 maximum junction temperature: 110°C at 85°C chassis cold-wall
• SVME board operation at 11 CFM airflow
## Key Features
• Dual-processor architecture with firewall isolation between CPU and IMPs
• Programmable serial pre-processor supporting FM0 data encoding with customization for FM1 and Manchester encoding
• Built-In-Test (BIT) for hardware verification
• Bus Isolation mode (BI-mode®)
• Auto-ID and location monitor capabilities
• IMP priority access to serial data memory ensures continuous processing without CPU impact
## Typical Applications
Military avionics, industrial process control, multi-protocol serial networking, and systems requiring deterministic synchronous and asynchronous communication in thermally constrained or high-reliability environments.
## Compatibility & Integration
Standard VME64 architecture support enables integration into VMEbus-based systems. Conduction cooling design and configurable ruggedization levels suit deployment in harsh aerospace and defense platforms.
