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Altera_Forum
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12 years ago

What is the recommended way to use ddr input clocks

Hi,

I am using a cyclone V SOC fpga. I have a general question about the recommended way to treat a ddr differential input clock. I am working on a project where I am mimicing a mddr chip. So I have to write and read data with an incomming differential clock like a ddr chip would. I am using a

ALTDDIO_BDIR for the data path. My question is what would be the recommended circuit for the incomming clock? Do I connect it to an LVDS reciever and feed the input to a PLL? Then put a single ended PLL output to the outclock of the ALTDDIO_BDIR? There are lots of examples on memory interfaces driving the diff clock out but I didn't find any on bringing it in with the DDIO buffers.

Thanks!
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