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Altera_Forum
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11 years ago

Taking input by expansion header

Hello I am working with a project using DE1 board. In my project I have to take input from a external circuit of 3.5 v . I use seven segment display to see my output in DE1 board . My verilog ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

When i use gpio pin as input direction it gives me the output voltage 3.5 volts . I use i/o standard default lvttl 3.5(default) . How can i unify the ground pin. How can i tell i am going to use a pin as ground in my program?