Forum Discussion

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

Errors reading M9K dual port in Cyclone III

Hi, We are using four Megawizard generated dual ports in a 3C40F484C8. There are 128 locations, 24 bits wide, asynchronous write and read clocks. A common write_data and write_address bus goes to ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

With SignalTap, are you opening Assignments -> Partition Window and setting the top-level partition to Post-Fit Placement and Routing? Then in SignalTap only tap Post-Fit nodes. This way the place-and-route doesn't change and hopefully the problem stays the same as you tap different nodes. (You may already be doing this, but if it goes away when tapping then you may not). Plus you get faster SignalTap compiles.

Are the oscillators going through PLLs? If you re-read the same location(if possible), does it give different values?