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Altera_Forum's avatar
Altera_Forum
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16 years ago

open-drain/open collector type of output

Hi All, This might have been discussed before, but I didn't see a definite answer. I have one IO pins which I wanna assign it to be a open-drain type. I tried to add the following attribute ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Without knowing the exact transistor circuit of the output driver block, you can only guess about the purpose of a dedicated open drain feature. It could be better switching behaviour. And I imagine, it can be achieved by extending the current strength and impedance control by compeletely disabling the high side output transistors.