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When i found this problems with my own designs would be, all the time, that i have surpased the fmax acceptable for the system/FPGA i was running on
Maybe with a time constraining you will fix this.
What i have found to work is (obviously) to low the clock speed to slower values.
(For example, NIOS II running over 110 MHz in a 7 speed grade Cyclone II would fail to verify; after making the clock 100MHz, it would run find)
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Thanks for your reply!
Your message is very helpful.
But I think my problem is about the nios2eds for Linux version.
Because I downloaded the nios2 sys using Windows version, and it ran well.But I downloaded the same project using the Linux version, it couldn't run well.
Maybe there were some error when I installed the Linux version, and some .so file couldn't be found. And I use the command 'sudo ln -sf ' to link the .so file.But I thought there were some other errors.
Maybe the nois2eds for Linux version does not work well on Ubuntu, and maybe it will work well on the RedHat.
I had change to the Windows xp.
After accomplishing my project which my teacher assigned to me, I will try to solve it.
And thanks to you again.You message is really helpful.
If you installed the nios2eds on Ubuntu, please share your installation experience to me!