Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

config pins and 1.2V

Hello, I am currently designing a board with Cyclone III EP3C80 780 pin (I'm new in Altera world). I have several banks with VCCIO 1.2V, but my concern is the configuration pins. I have an...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

The configuration pins use the VccIO voltage of the bank they reside in, except the MSEL pins.

You should use 3.3V VccIO for the bank that is connected to the EPCS, and for the others you can use any voltage. If you power the bank 5 at 1.2V, then the DEV_CLRn signal will also use the 1.2V standard (for inputs I believe that you can use different voltage levels than the bank VccIO, but there are some limits, described somewhere in the Cyclone III datasheet).