Industry Expert Blogs

Way back in 2004, I wrote a book called Co-Verification of Hardware and Software for ARM SoC Design. At that time the world revolved around AHB and the ARM926EJ-S was a popular CPU. All ARM CPUs used two interrupt signals, nIRQ and nFIQ. The nIRQ signalis the normal interrupt request and nFIQ is the fast interrupt request. The bus signals for these two interrupts are active low signals, so driving the signal low indicates an interrupt. The ARM architecture defined exception addresses as shown the table below. 

Click here to read more ...