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Altera_Forum
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13 years ago

2.5V VCIO for Configuration Pins

I am using a Cyclone III. I want to use the LVDS IO on Bank 1. I assume that I must set the VIO for Bank 1 to 2.5V. So now I assume I must use the 2.5V IO standard for the configuration pins ...
Altera_Forum's avatar
Altera_Forum
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13 years ago

Altera is suggesting in several places not to use buffers for the serial flash interface. Of course it may work though, particularlywith fast logic series like AUP.

My personal fovourite would be to operate the EPCS device at a reduced 3.3V voltage, e.g. 2.8-3 V that will give sufficient voltage margin for the EPCS input signals. Or try with 2.5V compatible M25PX16. It's downwards compatible to M25P16/EPCS16, except for the unsupported electronic signature with command 0xAB. Signature check can be disabled in Quartus, but I didn't yet try.