Forum Discussion
Honored ContributorOn-Chip Memory instruction corruption
We have a design which uses a NIOS CPU whose instruction code is stored in On-Chip Memory. Most of the time everything works however there are times when the code is changed slightly and either the firmware consistently jumps to the beginning of the code or the code appears to freeze. This happens even when we add code that has no functional application to the system (e.g. adding debug lines to the code). We have checked the size of the memory and the size of the code and there is more the ample space for the stack. Also we have compared the contents of the Flash in which the code is stored to the code that is copied into the On Chip Memory and they are identical.
Does anyone have any ideas where we should start our debug ?14 Replies
Altera_ForumI have worked on the timing and got the violations down a lot - I have posted the report. The remaining are violations don't appear to be significant (at least to the area of the design that I am working on)
I check the design and it is still showing this bug ??????- Altera_Forum
You have violations yet
- Altera_Forum
This problem has occurred when we changed the code at times we added code and times we deleted code.
- Altera_Forum
My 2 cents; If you suspect a timing problem, try slowing down the clock and see if the problem persists.
