DIRECT MEMORY ACCESS METHODS APPLIED TO CHAOTIC BEHAVIOR EXPERIMENTS

This paper deals with the implementation of a PC-controlled benchmark specially suited to real-time experimental investigation of oscillator s driven by impulsive parametric pulses. The benchmark performs both t he acquisition of the output signal and the generation of the parametr ic pulses, It also allows the introduction of a programmable delay to investigate its influence on the dynamics of the oscillator. The time required for the building of each pulse has been reduced from 10 ms (t ypical setting time of a standard programmable generator) to 15 mu s, employing the standard PC's direct memory access (DMA) transfer and pu lse generation capabilities, allowing the investigation of oscillators with relevant frequency content up to 30 kHz.