Error (13076): The node "XXXX" has multiple drivers due to the non-tri-state driver "XXXX"

Description

Due to a problem in the Intel® Quartus® Prime Pro Edition software version 19.1 and earlier, you may see this error when the design does not contains a complete Case declaration.

Resolution

To work around this problem, make sure your design contains the default state within the Case declaration.

case (XX)

1: <user defined conditions>;

2: <user defined conditions>;

3: <user defined conditions>;

default: <user defined conditions>;

endcase