2) with Graal, you can draw layout 3) Alliance is based on bits. xsch can't view a bit_vector 4) yes, adder: S <= A xor B xor CY(63 downto 0); CY(0)<= Cin; Cout <= CY(64); -- Arithmetic adder description. CY(64 downto 1) <= (A and B ) or (A and CY(63 downto 0)) or (CY(63 downto 0) and B ); GIIE wrote: > Hello sirs, > > Thanks for the help for my last inquiry. I would like to > know if there has been a solution to the RING errors > I reported late last year coz all my designs are stuck at that point. > > My next question is whether its possible in Alliance to layout a > circuit manually - I mean designing > my circuit from scratch in transistor layout. I know there is the SCR > tool for automatic layout, but just in comparison > to other tools, whether its possible in Alliance to do manual layout. > > Lastly, I would like to know if its possible to display a bit_vector > signal(as a single line) using the xsch tool. For example, it displays > a 32-bit(31 downto 0) signal/conection as individual lines(from 0 to > 31 = 32 lines). For many 32-bit connections like my design, the > display is quite messy and it takes a while to differentiate the > signals here and there. Is there a command to accomplish this kind of > display. > > Thanks again for your help > GIIE > > > ----------------------------------------------------------------------- > Do You Yahoo!? > Send FREE Valentine eCards with Yahoo! Greetings!