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Intel: Changing the Current Strength setting on the Assignment Editor and compiling causes an error in the Fitter. Please let me know what could be the cause.

Quartus Prime

If the error message says "Current Strength logic option is set to for pin "", but setting is not allowed with a Termination assignment", it is caused by a constraint on the pin.
 
In this case, the Current Strength setting and the OCT (On-Chip Termination with Calibration) setting cannot be enabled at the same time.
(Because both are functions realized by adjusting the output resistance)
 
Please reconfigure to only one of the functions.

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