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Altera_Forum's avatar
Altera_Forum
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15 years ago

default voltage for the cyclone 3 why is 2.5

when i consult the cyclone 3 datasheet,the VCCIO for c-3 is 3.3V,but when set the pin planner in QUARTUSII or the menu of assignment->device/ device and pin options/voltage tab:default I/O standard i...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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why there is that kind of settings in the software

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The VCCIO value is mainly used to calculate IO current strength settings, but it's not changing configuration data directly. Furthermore, Quartus checks the consistency of IO assignments in each bank, e.g. a Bank using LVDS IOs must use exclusively a VCCIO of 2.5V.