General Technical Discussion

[weilings]

This is what I got when I synthesis a project with dpram: WARNING:Xst:2211 - "D:/ISE/learning/project/dpram/dpram/mother_board.vhd" line 86: Instantiating black box module . I think I declaraed and instantiate all the ports ,I don't know what happened!

[gszakacs · Accepted solution]

Usually you get the "black box" warning because the underlying code for the instantiated

entity is not included in your project, or for some reason has not been compiled.  I have found

that if you try to build the project and get the black box error, then add the module you were missing,

sometimes ISE will not compile the newly added module unless you first "cleanup project files."

-- Gabor

[weilings]

I got it