Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Anybody know this ?

Hi, I use Nios3.1, QuartusII 4.0, and APEX 20KE. I use ISR and DMA to design my circuit. And I have a question now. I hope to know that how much time does the nr_installuserisr() functio...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Are you asking how long is nr_installuserisr() or the actual ISR itself? (nr_installuserisr() just gets things setup so that an interupt will trigger your ISR). The install routine is just part of the constant setup time of your system so I'm a little bit confused why you want to know (unless you have one of those systems that has to come out of reset very quickly).

Here's the exception handler documenation: http://www.altera.com/literature/an/an284.pdf (http://www.altera.com/literature/an/an284.pdf)

I saw some benchmarks in there for the specific software example that is included (Uart).