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Altera_Forum
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14 years ago

Cyclone III POR

I have a question about how the POR circuit works on a Cyclone II FPGA. I know there are two different PORs, Fast POR (3ms-9ms) and Standard POR (50ms-200ms). In some of the documentation I see tha...
Altera_Forum's avatar
Altera_Forum
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14 years ago

If you use a fast POR and a slow power supply ramp rate, then you have a risk that the FPGA attempts to start a configuration before the power supply voltage reached its nominal value. In that case there is no guarantee the FPGA will initialize properly.