Quartus

BIDIR pin <name> cannot be assigned more than one value. Created single value from multiple values, but single value cannot be used.

CAUSE: In a Text Design File (.tdf), you assigned multiple values to the specified BIDIR pin. The Compiler performed a logical OR operation on the values to create a single value, but you cannot use the created value because you cannot use logic to drive a BIDIR pin.
ACTION: Assign the multiple values to the input of a TRI buffer, and drive the BIDIR pin with the TRI buffer.

See also:

Implementing Bidirectional Pins

- PLDWorld -

 
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