Experimental Research on Interrupt Latency Time of ARM Microprocessor
Jibin Hu · Jisuanji gongcheng · 2011
The interrupt processing of ARM microprocessor S3C2440A is introduced briefly.An experiment to measure the interrupt latency time of FIQ and IRQ is designed and accomplished.Two fitting functions of the experimental data are given.It can be concluded that the interrupt latency time of FIQ and IRQ is almost the same.They have little relationship with the processor cycles and are only in inverse proportion to the frequency of the clock of the interrupt controller.The interrupt latency time while the cache is enabled is less than 1/3 of that while the cache is disabled.