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Fixed and Floating point packages

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<p align="right"><font color="#cecece" face="Arial" size="6"> __VHDL-2008 Support Library__ </font></p>

These packages were designed as a bridge between VHDL-93 and VHDL-2008. I replicated as many of the new functions as possible. Note that all of these packages are design to be *synthesizable* in VHDL-93. So, as long as you stick to the subsets defined in the "README" files for the various vendors you should be able to take your code through the entire flow.

VHDL-2008 is finally getting some traction. &nbsp What started out as just a fixed and floating point package got merged into the VHDL LRM. On this page you will find definitions of the functions available in the VHDL-2008 libraries. You will also find VHDL-93 compatible code for those that do not yet have access to VHDL-2008 compilers.

There is a [[Fixed_ug.pdf][Fixed Point user's guide]] and a [[Float_ug.pdf][Floating Point user's guide]]. Please check the [[fpfaq.html][Fixed and floating point FAQ]] (%RED%NEW!%ENDCOLOR%) if you have any quesiton.

The VHDL-2008 packages will eventually be included in your vendor's environment. In some cases I have found that they may be encrypted due to [[http://ieee.org][IEEE]] rules. The packages available on this page are NOT the released packages, but VHDL-93 versions of those packages, which I published BEFORE the release of the LRM. They are free of copyright restrictions, and may be used for whatever purpose is needed.

VHDL-93 versions of the VHDL-2008 packages
   * Additions to std.standard [[standard_additions_c.vhdl]] ( [[standard_additions.html][user's guide]])
   * New package std.env [[env_c.vhdl]]
   * Additions to std.textio [[standard_textio_additions_c.vhdl]] ( [[std_textio_additions.html][user's guide]])
   * Additions to ieee.std_logic_1164 [[std_logic_1164_additions.vhdl]] ( [[std_logic_1164_additions.html][user's guide]])
   * Additions to ieee.numeric_std [[numeric_std_additions.vhdl]] ( [[numeric_std_additions.html][user's guide]])
   * New package numeric_std_unsigned [[numeric_std_unsigned_c.vhdl]] ( [[numeric_std_unsigned.html][user's guide]])
   * New package fixed_float_types [[fixed_float_types_c.vhdl]]
   * New package fixed_pkg [[fixed_pkg_c.vhdl]] ( [[Fixed_ug.pdf][Fixed Point user's guide]])
   * New package float_pkg [[float_pkg_c.vhdl]] ( [[Float_ug.pdf][Floating Point user's guide]])
   * [[vhdl2008c.zip][ZIP file of all the packages]] (updated 09/2010)
I use this code in most of my designs. Many times I find that I have to modify the code slightly in some tools, so I made this list. Included in the "source code" section for each tool is source code specifically debugged for that particluar tool. Click on the "documentation" link to see what changes I had to make, and how to use this code in the specific tool.
| *Vendor* | *Zip file* | *Notes* |
| <a href="http://www.altera.com" target="_top">Altera</a> | <a href="altera.zip" target="_top">Source code</a> | <a href="altera.html" target="_top">Documentation</a> |
| <a href="http://www.cadence.com" target="_top">Cadence ncvhdl</a> | <a href="cadence_ncvhdl.zip" target="_top">Source code</a> | <a href="cadence_ncvhdl.html" target="_top">Documentation</a> |
| <a href="http://www.cadence.com" target="_top">Cadence RC (new)</a> | <a href="cadence_rc.zip" target="_top">Source code</a> | <a href="cadence_rc.html" target="_top">Documentation</a> |
| <a href="http://www.model.com" target="_top">Modeltech</a> | <a href="modeltech.zip" target="_top">Source code</a> | <a href="modeltech.html" target="_top">Documentation</a> |
| <a href="http://www.synopsys.com" target="_top">Synopsys</a> | <a href="synopsys.zip" target="_top">Source code</a> | <a href="synopsys.html" target="_top">Documentation</a> |
| <a href="http://www.synplicity.com" target="_top">Synplicity</a> | <a href="synplicity.zip" target="_top">Source code</a> | <a href="synplicity.html" target="_top">Documentation</a> |
| <a href="http://www.xilinx.com" target="_top">Xilinx 11.1</a> | <a href="xilinx_11.zip" target="_top">Source code</a> | <a href="xilinx_11.html" target="_top">Documentation</a> |
| <a href="http://www.xilinx.com" target="_top">Xilinx 9.1</a> | <a href="xilinx.zip" target="_top">Source code</a> (old) | <a href="xilinx.html" target="_top">Documentation</a> |
| <a href="http://www.synopsys.com" target="_top">VCS</a> | <a href="vcs.zip" target="_top">Source code</a> | <a href="vcs.html" target="_top">Documentation</a> |
| <a href="http://www.mentor.com" target="_top">Spectrum 2009a</a> | <a href="leonardo.zip" target="_top">Source code</a> | <a href="leonardo.html" target="_top">Documentation</a> |
| Do do:<a href="http://www.aldec.com" target="_top">Aldec</a> |
<label> Some helpful code to go with these packages:</label>
   * [[fixed_noresize.vhdl]] Similar to "fixed_pkg", however this version uses the same rules that numeric_std does for the size of the result. This is done by calling the funciton in "fixed_pkg" and resizing the result.
   * [[float_noround_pkg.vhdl]] Similar to "float_pkg", however this version turns off all of the IEEE rounding and overflow, and defaults to a 26 bit floating point number. This package saves off 1/3 of the logic needed for full 32 bit floating point.
   * [[fixed_synth.vhdl]] Synthesis testcase for the fixed point package. [[test_fixed_synth.vhdl]] Testbench for the fixed point synthesis testcase.
   * [[float_synth.vhdl]] Synthesis testcase for the floating point package. [[test_float_synth.vhdl]] testbench for the floating point synthesis package
   * [[vhdl2008test.zip][Testbenches]] to verify an implimentation of VHDL-2008.
   * [[real_matrix_pkg.zip][Matrix Math package for type REAL]] which has a [[real_matrix_ug.pdf][user guide]] (Done in conjunction with [[http://www.eda-twiki.org/bin/view.cgi/P10761/][IEEE 1076.1 VHDL-AMS]])
Need some help with this code? Drop me an [[mailto:dbishopx@gmail.org][e-mail]], maybe I can help.<br /> _David W. Bishop [[mailto:dbishopx@gmail.org][dbishopx@gmail.org]]_.
Topic revision: r1 - 2016-04-29 - 17:30:40 - DavidBishop
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