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The fixed point package is part of the vhdl 2008 language spec. But quartus does not fully support 2008 yet - but David Bishop wrote a '93 compatible version of the fixed_pkg that compiles well with quartus (at least it worked just fine about 6 years ago and I dont see why it would stop working now - I infered rams and multipliers with it just fine). You can download it from here:
http://www.vhdl.org/fphdl/ This package doesnt really do anything other than integer arithmetic - it is just holds the numbers in an easier to understand (and modify) format. There is nothing you can do with this package you cannot do with integers (but it takes a little more careful though). The logic created is identical (as fixed point is simply integer arithmatic with an offset).
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Tricky regarding the VHDL 2008 library, is it confirmed that is not supported by Quartus Prime? I googled it and It says Quartus Prime works with VHDL-2008 support, would you clarify? Do I have to use a the proceed for loading the package?
Sorry for my poor english, I'm new in both, English and VHDL :P
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