Quartus II 7.2 & Declaring bus range problem

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Why this is necessary to define the shared values I just use this variable in current architecture...

sth strange...

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I wonder what you are trying to achieve with variables? I guess, most VHDL programmers don't even know, that shared variables exist. They follow the simple rule, that variables can be used in processes and subprograms, as written in most VHDL textbooks. You have to read the full IEEE VHDL specification to learn about shared variables. Apparently, no one misses them, normally.