Hi ppk031000,
Perhaps it's resulted from the conflicting of external tri-state bus between
2 memory devices on your board. Because I haven't used the board you mentioned,
so it's just my speculation.I may give you two suggestions:
1)Perhaps it's because of your carelessness when you created your system,
so reopen SOPCBuilder and the SDRAM component wizard.Now check
the selection for "Share pins for via Tri-state Bridge" is checked or not,
you should *check it* to avoid the bus-sharing result of SDRAM.
2)If the 1) cannot resolve your problem,Go to download or write
by yourself a MUX module for your conflicted pins
http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/wink.gif
Regards,
Don