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ENTITY err IS PORT ( clk : IN BIT; i : IN BIT; o : OUT BIT ); END err; ARCHITECTURE a OF err IS COMPONENT dff PORT (d, clk : IN BIT; q : OUT BIT); END COMPONENT; BEGIN dff1 : dff PORT MAP (i=>i, q=>o, clk=>clk); END a;You must declare a formal port or parameter before you associate an actual with it.
ACTION: Check the object declaration for the correct list of declared formal ports or parameters. If necessary, add a declaration for the specified formal to the object, or modify the association list so it associates the actual with the correct formal port or parameter. For example, in the association list above, i=>i should be d=>i.
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