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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!Link Copied
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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- Mark as New
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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- Mark as New
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--- 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
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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- Mark as New
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I can't understand what you want to say in the code word of "PLL"...?
can you please explain? genemedics (http://www.genemedics.com/growth-hormone/) // genemedics.com (http://www.genemedics.com/estrogen/) // progesterone in men (http://www.genemedics.com/progesterone/)- Mark as New
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--- 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

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