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Altera_Forum
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21 years ago

NIOS II Custom Instruction access to CPU Regs'

Hi, I'm looking for a solution to access internal CPU Register via a custom instruction. I didn't found anything about this in NIOS II documentation. My problem is following : ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

Hi,

I placed the service routine in On Chip memory. But it is the same. I'm wonderring why it took so long, because I counted the assembler commands for alt_irq_entry.h and alt_irq_handler. I calculated an interrupt responce time of about 1,5µs. (target system is NIOS II f core at 50MHz) And I'd like to know why my system need so much time. Did you have any expierience on interrupt service request time on NIOS II ? We only like to know, how much time an interrupt need on NIOS II system.

Thanks