Forum Discussion

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

Minimal pulse duration for VIC to recognize an interrupt?

Hi I'm using a cyclone III (EP3C40F48I8N) with a Nios II/f . On a custom component I have a tristate slave interface with an "Interrupt Sender". I found out, that a pulse on the irq of 1...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I had a look to the datasheet before sending my reply, and if I'm not mistaken you can clear the IRQ signal from the LAN9211 just by writing to the interrupt status register. You don't have to actually read the data. That's why I suggested that way of doing it.

Disabling the interrupt from the isr should be possible (I assume you want to mask the interrupt source in the VIC?) without any problem, but I think it is better to disable the source directly in the LAN chip. That way you won't have any trouble porting your code to a system without VIC one day, if required.