IO open drain configuration question.

Hi,

you don't need assignment pin planner or assignment editor to implement open drain, you can also infer open drain output directly in HDL by driving an inout pin to '0' and 'Z' respectively. Resource Property Editor shows that open drain mode is implemented for output buffer.

SDA <= '0' WHEN sda_oen = '0' else 'Z';

Default compiler setting AUTO_OPEN_DRAIN_PINS on is presumed.

Regards

Frank