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Altera_Forum's avatar
Altera_Forum
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11 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
11 years ago

Hi There!

If you have a reset controller that can monitor the CONF_DONE pin, you should be fine. Another would be to determine how long the configuration time takes. I did this with an EPF10k10, which came in somewhere around 300ms. I then used a standard reset-controller that would pull reset low for about 500ms, well exceeding the 300ms configuration time. Once the FPGA is configured, you'd just have a 500ms reset controller.

Hope this helps,

-Mux