dc motor parking gate project in quartus 2 v8.0 for altera flex10k

Can you be a bit more specific. Do you want to let it stop automatically, or do you want to use a remote?

The code you gave was correct (you could remove the 2-bit vector z becouse you don't use it) but doesn't explain what you want.

If you tell a bit more about your requirements, we might be able to help you.

Also you might want to try some simple designs that help you understand the language, like a knightrider effect on some LEDs or a simple pattern recognition device.