Forum Discussion

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

Selectable LVTTL Inputs - Cyclone II

Hello All, I recently discovered this forum and very excited about the wealth of information it contains. Anyway, I have what might be considered a novice question. I'm hoping to find th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

--- Quote Start ---

Also, I think the VCCIO pins might be tied to 3.3V on the custom board I'm using, will this make it incompatable to read 1.8V LVTTL?

--- Quote End ---

The device handbook will answer that question. Compare the VIH min that you think you will actually have to the requirement for the I/O standards that use VCCIO set to 3.3V.