error occurs when i changed my FPGA

[Altera_Forum]

first, i used the Cyclone, my program ran correctly. 

then, i changed it to Cyclone IV, then the error occurs. some controlling order in my program is wrong, i have not changed my program. so , what's the matter? someone can help me?

[Altera_Forum]

what error?

[Altera_Forum]

of course. Cyclone (I) and Cyclone IV are different devices (obviously).

[Altera_Forum]

--- Quote Start ---  what error?  --- Quote End ---    My program control different periphery devices, such as valves, stepmotors. when i changed my FPGA, the control signals are not correct, so these periphery devices can't work Normally.

[Altera_Forum]

--- Quote Start ---  of course. Cyclone (I) and Cyclone IV are different devices (obviously).  --- Quote End ---    i konw, but i changed the setup(device) in Quartus. So, the program should ran correctly.(i have tested an easy demo, and it run correctly in Cyclone IV)

[Altera_Forum]

when you changed the device, there should be a warning saying that your pin assignments will be gone.

[Altera_Forum]

Yes, the first thing I would check is the pin assignments.

[Altera_Forum]

--- Quote Start ---  when you changed the device, there should be a warning saying that your pin assignments will be gone.  --- Quote End ---    i changed, of course.  the problem is solved!!! i changed my program in some details. the error occurs in one of a state machines, but i can't talk it more detailed because of keeping secrets for my boss.  i still don't know there are differences when the same program runs in different FPGAs. can you give me some advice?

[Altera_Forum]

--- Quote Start ---  Yes, the first thing I would check is the pin assignments.  --- Quote End ---    i changed, of course.  the problem is solved!!! i changed my program in some details. the error occurs in one of a state machines, but i can't talk it more detailed because of keeping secrets for my boss.  i still don't know there are differences when the same program runs in different FPGAs. can you give me some advice?

[Altera_Forum]

From Cyclone to Cyclone IV there are differences in the PLLs, the memory components, some I/O features, timing and of course the pins. All of those can cause errors.