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Altera_Forum
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10 years ago

3.3V clock input on ddr3 i/o bank

Hi I have a board with a cyclone v (5CEFA2F23C8) and a ddr3 ram. On the same I/O-bank 7A as the ddr3 I have a clock input, as needed for running the ddr3-pll. My problem is, the pll does not lo...
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Altera_Forum
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10 years ago

Thanks for the link alex. Now it makes sense, one board was working and my second board didn't. I had in my mind, that cyclone IOs would tolerate higher voltages when they are inputs. I will place a voltage divider in between.