Forum Discussion

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

Maximum Nios Frequency

Hi, what is a maximum frequency applicable to different class of Nios II processor, considering that the other logics on FPGA does not contains critical path ?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

I think around 100MHz in a Cyclone III.

But it indeed depends a lot on your system. Faster is possible...

Also consider that not only the clock speed determines the system speed. If you have your off-chip memory (for example DDR) at a differetn clock speed, you can end up with a bottleneck to the memory due to clock domain crossing issues.

Benchmarks are always generated using the fastest possible speed grade of components, with only use of on-chip RAM (possible only connected to a tightly coupled interface), and sometimes with some compiler tricks to get some higher numbers in the reports.

Stefaan