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Altera_Forum's avatar
Altera_Forum
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15 years ago

Same logic high ,but different voltage

Hi,guys. So why different pins have different voltage, while they are all logic high. (In my experiment,one is 1.14V, the other is 3.3V) Appreciate for any reply
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

No Cyclone family supports higher VCCIO than 3.3V. Maximum in Cyclone II specified operation conditions is 3.6V. 1.14 V is clearly an invalid output voltage for 3.3V-LVTTL, so either the hardware or the configuration is wrong.