Forum Discussion

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

unused pin and Quartus option set

In the cyclone iii Pin Connection Guidelines, some types unused pins are recommended to connnect to VCCIO, and some are recommended to connnect to GND. I have two questions: 1. Which option shoul...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The power dissipation will be greater than neccesary if you connect the pins to GND, due to the internal pull-up to VCCIO. But because it´s a weak pull-up, that´s no big deal.

If you use a 0 Ohm resistor instead of a hardwired connection, you can leave it out if desired.

Good luck, Ton