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Honored Contributor
Honored ContributorCyclone III power up
When I power up the cyclone III board I see a 2.5V ~100msec pulse on the HSMC Bidirectional ports. From what I understand it is due to a weak pullup resitor on the output. I found in the pin planner ...
Altera_ForumHonored Contributor
Honored Contributor --- Quote Start --- From what I read (Hot socketing and Power on Reset document) I have no choice but to use a stronger pull down R to prevent it from triggering my cct during power up. --- Quote End --- Quite right. To prevent false output signals during power up, you can either use a high idle state of the respective IOs or external pull-down resistors.
