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# ** Error: C:/Users/..../Downloads/altera/fixed_pkg_c.vhdl(22): Library ieee_proposed not found.
# ** Error: C:/Users/..../Downloads/altera/fixed_pkg_c.vhdl(23): (vcom-1136) Unknown identifier "IEEE_PROPOSED".
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# ** Error: C:/Users/..../Downloads/altera/fixed_pkg_c.vhdl(25): VHDL Compiler exiting
Model Sim doesn't like the VHDL 2008? Quartus II seems to compile, but when I try to use modelsim for simulating it gives me this error.
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This is because you didnt create the ieee_proposed library in modelsim. Quartus is quite relaxed when it comes to libraries unless you specify them - it just searches all design units for the correct packages.
as you might have guessed, ieee_proposed was just a placeholder name for the code before it was officially released, and still holds for the '93 compatible code. You can modify it if you wish to be ieee or work. But modelsim already has the fixed_point libraries (in 2008 format) in the ieee library.
as for your code, resultado needs to be declared:
resultado : out ufixed (3 downto -7);
Otherwise you miss the carry bit (numbers never get smaller when added).
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