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Altera_Forum's avatar
Altera_Forum
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18 years ago

Difference between VCCIO and VREF?

hi,everyone. i just start to use fpga cycloneIII,and i have a question which may be easy to answer. Thank you. question :is it right that VCCIO just supply the power?for example,if i want...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Hi,

I've red somewhere that 1.25V should be asserted to the VREF pins (with Cyclones III) when using the LVDS standard.

However, I do not find anything clear about that in the device familly handbook...

So if I use LVDS signalings with a bank, I must apply 2.5V to VCCIO pins and what about the VREF pins?

Yours faithfully