The bc330VME is a single-height (3U) VMEbus Time Code Reader/Processor that decodes multiple serial time code formats and delivers microsecond-resolution timing to VME-based systems. Operating as an A16:D08(O) slave, it provides continuous time provision during input code loss, external event triggering with time-stamped capture, and programmable propagation delay compensation. The module integrates directly into standard VMEbus architectures per IEEE 1014-1987, Revision C.1, with flexible interrupt handling and configurable address mapping within the VMEbus short address space.
Technical Specifications
• Form Factor: Single-height (3U) VMEbus module
• VMEbus Compliance: IEEE 1014-1987, Revision C.1; A16:D08(O) slave operation
• Address Space: 4K byte block, locatable on any 4K byte boundary in VMEbus short address space
• Time Code Formats Supported: IRIG A, IRIG B, 2137, NASA 36, MILA
• Time Resolution: Microsecond
• Event Capture Input: TTL/CMOS, positive or negative edge triggered
• Event Capture Pulse Width: Minimum 50 ns
• Event Capture Period: Minimum 500 µs
• Propagation Delay Compensation: Programmable range -2048 to +2047 units (0.5 µsec per unit)
• Output Signals: 1 Pulse Per Second (1PPS) and Heartbeat Pulse, both TTL/CMOS
• Operating Temperature: 0° to 70° C
• Rack Accommodation: 3U or 6U (with optional front panel)
• I/O Connectivity: Front panel and P2 connector (with -6UD option)
– Key Features
• Continuous time provision during input time code loss
• External event input freezes time and loads Event Capture Time Data Block upon appropriate edge detection
• Host-controlled operation via VMEbus register configuration
• Configurable interrupt priority levels and vectors
• Programmable heartbeat interval rate
• Flexible propagation delay compensation for long cable runs between time code source and module
– Typical Applications
• Precision timing and synchronization in VME-based test and measurement systems
• Time-stamped event logging and data correlation
• Systems requiring multiple time code format support
– Compatibility & Integration
The bc330VME integrates into standard VMEbus subracks and systems. Extension capability exists via connection to Datum extension modules for enhanced functionality.
