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Altera_Forum's avatar
Altera_Forum
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15 years ago

3.3 V Output needed from Cyclone III Starter Kit

Here is a simple question: q: how do i generate a 3.3 v level digital output from my cyclone iii starter kit ? i setup the following experiment: 1) I wrote a simple code to transfer a di...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I guess, you refer to the Altera EP3C25 Starter Board? Please take a look at the schematic sheet 8. All 8 VVCIO nodes are tight to VCC25 (2.5V supply) as well as VCCA, which is restricted to 2.5V. I don't see, that the design provides an option to change the voltage of an individual bank.

Did you check, if your hardware can possibly work with 2.5 V logic level as well? The FPGA inputs can be driven with 3.3V logic level, as long as the maximum ratings are kept and overshoots are avoided. If you absolutely need 3.3V logic level, an external level converter has to be utilized.