Dedicated clock pin on DE2

[Altera_Forum]

Hi 

 Is there a way to get a clock signal from an external device into any PLL clockin on the DE2?  I've read that those clockin must be from a dedicated clock, but if I search in the manual of DE2 and the pin planer for the EP2C35F672C6(the FPGA on the DE2), those pins are already use by switches and stuff, not a single one avaible on the I/O connector.  How can I set up the PLL to use one of this I/O in the 40 pin connector?, or How can I get into the PLL a signal coming from other device?  Thanks a lot!

[Altera_Forum]

Please review the schematic for the DE2. There are several versions of this board (DE2, DE2-70, DE2-115) 

 On the DE2, there is an SMA on the board, it connects to pin P26 which is called CLOCK_EXT in the schematic and connects to CLK7 on the FPGA.  You should be able to use that.  Cheers, Dave

[Altera_Forum]

Thanks dwh 

My board says just DE2, so I'll use the SMA... Is anything else for configuration to use this for the PLL? I mean, I've created a PLL with the megafunction where do I tell it to use CLK7 or its just by setting the PLL clockin port to CLOCK_EXT in the pin planer? Thanks

[Altera_Forum]

--- Quote Start ---   Is anything else for configuration to use this for the PLL? I mean, I've created a PLL with the megafunction where do I tell it to use CLK7 or its just by setting the PLL clockin port to CLOCK_EXT in the pin planer?   --- Quote End ---  You can call the clock port/net anything you like, just so long as you set the pin to P26. For example, I call it clk_sma in my top-level design file.  You then connect that net name as the clock input to your PLL megafunction instance.  I would recommend creating a counter and use it to blink an LED once per second. If you have the PLL configured correctly, then it'll be pretty obvious.  This thread:  http://www.alteraforum.com/forum/showthread.php?t=33462  has an example zip file called de2_basic.zip. Download it and follow the instructions. It doesn't have a PLL in the example, but you could add it easily enough.  Cheers, Dave

[Altera_Forum]

Thanks a lot! 

The LED idea is good for testing I guess.  And thanks for the zip, I'll check it soon as I arrive to my lab

[Altera_Forum]

I can't understand what you want to say in the code word of "PLL"...? 

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[Altera_Forum]

--- Quote Start ---  I can't understand what you want to say in the code word of "PLL"...? can you please explain?  --- Quote End ---    PLL = phase-locked loop  http://en.wikipedia.org/wiki/pll  Cheers, Dave