A pleasant good morning sir, Thank you for your assistance on my last questions, however I still have some more concerns in the "Design of a 1 bit Adder using Alliance" tutorial. http://www-asim.lip6.fr/alliance/doc/jumpstart/Examples/FullAdder.html When I get to the portion: "Using Asimut to simulate the synthesized structural description", and type the command : asimut halfadderl halfadder r2, I get the following errors: . . initializing ... searching `halfadder1` ... compiling `halfadder1` (Structural) ... flattening the root figure ... searching `a2_x2` ... BEH : Compiling `a2_x2.vbe` (Behaviour) ... making GEX ... searching `nao2o22_x1` ... BEH : Compiling `nao2o22_x1.vbe` (Behaviour) ... making GEX ... searching `inv_x1` ... BEH : Compiling `inv_x1.vbe` (Behaviour) ... making GEX ... searching pattern file : `halfadder` ... restoring ... linking ... executing ... ###----- processing pattern 0 : 0 ps -----### Error 113: expected value differs from the simulation's result on `sum` Error 113: expected value differs from the simulation's result on `carry` ###----- processing pattern 1 : 1 ps -----### Error 113: expected value differs from the simulation's result on `sum` Error 113: expected value differs from the simulation's result on `carry` ###----- processing pattern 2 : 2 ps -----### Error 113: expected value differs from the simulation's result on `sum` Error 113: expected value differs from the simulation's result on `carry` ###----- processing pattern 3 : 3 ps -----### Error 113: expected value differs from the simulation's result on `sum` Error 113: expected value differs from the simulation's result on `carry` bash-2.02$ sir what is the cause of this error? Is it from the ".c" file or? (I used the .vbe and .c files on the site.) What do I do to correct the problem? Thanks sir. I am hoping for your reply. John DB --------------------------------- Do You Yahoo!? Make a great connection at Yahoo! Personals.