The Concurrent Computer Corporation Real-Time Clock and Interrupt Module (RCIM II) is a PCI-based multifunction card engineered for time-critical applications on Concurrent iHawk multiprocessing systems. It delivers precise timekeeping, interrupt generation, and distributed event synchronization across single and multiple systems—essential for simulation, data acquisition, and industrial control environments running RedHawk Linux.
## Technical Specifications
**Real-Time Clocks**
• Eight 32-bit programmable POSIX-compliant real-time clocks
• 64-bit clock resolution with 400 nsec low-order granularity
• Minimum resolution: 1 microsecond
• Decrementing counters that interrupt on zero crossing
• One-shot and periodic operating modes with automatic value reload
• Programmable to generate fixed frequencies (e.g., 600 Hz)
**External Interrupts**
• Twelve edge-triggered input lines and twelve output lines
• Each input independently configurable for edge/level sensitivity and polarity
• Input termination: 180 ohms to +5 V; 330 ohms and 0.1 µF to ground
• Requires line driver capable of sinking minimum 30 mA
• Output signals driven by 74ABT16240 line driver
• Runtime control: arm, disarm, enable, disable, and sensitivity selection per line
**Distributed Interrupts**
• Twelve distributed interrupt inputs and twelve outputs per RCIM
• Enables deterministic event synchronization across multiple iHawk systems
• Sources: real-time clocks, external edge-triggered inputs, or software
• Chained configuration via synchronization cables for inter-CPU notification
• Allows single-CPU events to propagate to multiple connected systems
## Key Features
• PCI interface integration with iHawk multiprocessing architecture
• Custom interrupt source injection via external input lines
• Distributed interrupt chaining for multi-system event coordination
• Full RedHawk Linux driver support
## Typical Applications
Real-time simulation, distributed data acquisition, industrial control systems requiring synchronized multi-CPU event handling, and time-critical process scheduling.
## Compatibility & Integration
Designed for Concurrent iHawk systems running RedHawk Linux real-time operating system.
