vhdl and math_ieee

[Patrice]

Helo
I use quartus web edition, and made me some routines but
sundely a saw that there is no math_real library in quarus !
Does it mean what mathematical operation on real cannot be made
with this board ?? (i'm interrested in sqrt function)

Thanks for reply

 

[Jim Lewis]

Patrice,
In general synthesis tools do not support type real.
No way to size the exponent and mantissa.

The IEEE standards groups are working on new packages
that create an array type to do fixed and floating point
math. Currently they are drafts and are likely to change
before standardization, however, there is a

Fixed Point Packages (following link needs to be one line):
http://www.eda.org/vhdl-200x/vhdl-200x-ft/proposals/numeric_packages/n008_fixed_point.html

Floating Point Packages (following link needs to be one line):
http://www.eda.org/vhdl-200x/vhdl-200x-ft/proposals/numeric_packages/n009_floating_point.html

Cheers,
Jim Lewis
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Jim Lewis
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SynthWorks Design Inc. http://www.SynthWorks.com
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