Enabling Schmitt Triggers for MAX V in Quartus

[SOLVED]

Hello everyone,

I have recently gotten into programmable logic, and intend to use a MAX V CPLD (5M570ZT100C5N) in one of my projects, specifically for processing some quadrature encoder inputs.

Part of the noise-filtering circuitry requires the use of Schmitt-triggers, and I saw that the MAX V has built-in schmitt-triggers on the I/O pins.

I am just wondering how you enable these schmitt-triggers in Quartus II.

Thanks in advance,

BuildaMachine

EDIT: It is very simple, just change the I/O standard in the pin planner

On a side note, what is the difference between the CPLDs of the same family with the different suffixes (e.g. C4, C5 C5N)?