Forum Discussion

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

Nios II won't work after uploaded to the board

Greetings, I have a Nios II design that i've built from scratch, mainly following instructions on the book Rapid Prototyping of Digital System. It compiles without errors (but several warnin...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I'm not at sure why the SDRAM clock has to be 'early' - since the simple timing analysis then gives errors. The errors can be removed by changing the skew (I increased it a bit - more -ve) - but then the sdram didn't work!

IIRC the cyclone dev board needed about -3.4ns, I suspect this is actually independant of the clock speed!