Intel® Quartus® Prime Design Software, Design Entry, Synthesis, Simulation, Verification, Timing Analysis, System Design (Platform Designer, formerly Qsys)
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I created a bdf schematic with a single 74191 from the maxplus2 library., and compiled without error. Then I converted the file to VHDL and tried to compile it. Result has 2 syntax errors. Bug in Quartus (Win7 64-bit) converter?
In vhdl the entity names must begin with a letter like "ic_74191". Probably schematic editor accepted a numeric name for your top entity but a vhdl source don't. Try to change the name of the bdf file and the convert it to vhdl.
