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Altera_Forum's avatar
Altera_Forum
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12 years ago

FPGA external reset

hi， I am using Cyclone III,and I'd like to have my own external reset.but I am not sure when to safely insert external reset ASAP. Do I have to use it after CONF_DONE goes high? i...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Hi，Mux，

thanks for your suggestion, I know from your answer there are two ways to do so. One is to apply external reset after CONF_DONE goes high. Another is to start the external reset(POR) even when configuration, but need to make sure the low external reset time is longer than the configuration.

Is it a potential issue when external reset starts but configuration is not finished. or how to understand the all the I/O are tri-stated when configuration, as I indicated above. thanks.