Curtiss-Wright / DY-4 SVME-739 Intelligent Serial Communications Controller

The Curtiss-Wright/DY-4 SVME-739 is an intelligent serial communications controller engineered for demanding industrial and military environments. It delivers 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.