The Microchip/TrueTime VME-DC-SG is a single-slot VME module that delivers precise timing signals and synchronization for VME-based systems. Operating as either a stand-alone or synchronized generator, it provides immediate access to time and status information via the VME computer bus with zero latency. The module combines flexible interrupt handling, configurable pulse generation, and multiple time-code output formats in a compact, bus-resident package.
Technical Specifications
• Form Factor: Single-slot VME module
• Timing Resolution: 1 µs
• Pulse Width: 2 ms
• Time Data Format: Five packed 16-bit BCD words accessible via VME bus
• Data Latency: Zero latency
• Time Capture: Two independent time-freeze registers—triggered on request from VME bus or external pulse
• Interrupts: Four independently programmable with software-selectable priority
• Time Compare: Dual time compare with microsecond resolution, capable of generating pulses and interrupts
• Rate Generator: Configurable for pulse output and interrupt generation at selected intervals
• VMEbus Compliance: IEEE 1014.C-1, configured as A16/D16 slave
• Address Modifiers: Hex 29 (short non-privileged) and hex 2D (short supervisory)
• Memory Addressing: Any 256-byte boundary in VME short address space via 8-position DIP switch
– Key Features
• Three front-panel BNC connectors for signal I/O
• Four front-panel status LEDs
• IRIG-B serial-code output (analog, 0V to 10V adjustable amplitude)
• IRIG-B DC (TTL) time-code output
• IRIG-B amplitude-modulated time-code output
• IRIG-B DC (RS-422) time-code output
• 1 PPS output
• VME P2/J2 connector interface
– Typical Applications
Demanding timing applications in VME-based test, measurement, and industrial control systems requiring microsecond-level synchronization and multiple independent interrupt streams.
– Compatibility & Integration
Fully compatible with IEEE 1014.C-1 VMEbus systems. Operates as slave device on standard 16-bit VME short address space with selectable memory boundaries.
