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Do a couple of simple examples and that may be enough for you if you are starting out and your design is relatively slow (say under 20 MHz).
Here's another good starter guide.
http://www.alteraforums.com/forum/showthread.php?p=2574 I doubt you will make it very far until you do some basic reviews like these.
Your design may very well work just fine, especially if it's fairly slow and isn't clock rate dependent, but to properly constrain it you have to learn to use Timequest and write sdc files.
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Thanks for your replay.
Yes you're right. I've decreased the speed of input signals and then the design worked properly..
Thanks for your advice :rolleyes: ;)
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