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Synopsys Design Compiler VHDL Files

abttje abttje is offline
Junior Member
Join Date: Jan 2008
Posts: 1
Hi all

I am having a problem with the gate-level VHDL file that Synopsys Design compiler produces after synthesis. Specifically, I am giving the following commands:

change_names -rules vhdl -hierarchy
write -hierarchy -format vhdl topdesign -output myfile.vhd

The VHDL file produced has a problem. In many cases, ports that are declared as type "out" are being used on the right side of signal assignment. For example, something like this is happening:

entity example is
port(ahbo: out std_logic_vector (3 downto 0).....
end example

architecture rtl of entity is
ahbo <= (ahbo(3), ahbo(2), ahbo(1), ahbo(0));

end rtl

Of course, when I try to simulate this post-synthesis netlist in ModeSim, it complains...does anyone know why this is happening and how I can get rid of it?

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