Hi, I'm currently working with the Altera DE2 board. To get started with it and the Quartus Software I've implemented a simple circuit using an open source IP-Core (PacoBlaze). The board provides two clock inputs, a 27MHz one and a 50 MHz one. For the first time implementing the design (timing constraints: 50MHz) I used the 50MHz clock and it worked perfectly. Then I tried to use the 27MHz clock and the design didnt work at all. The pushbuttons I used as an entry didnt have any effects on the outputs.
So now I'm wondering why it works with one clock but not with the other. I couldnt find that there is anything special with the 27MHz clock in the manual. Has anybody an idea what the reason for this could be?
Thanks in advance!