| Title | fixed_extensions (VHDL fixed-point arithmetic extensions package) |
| Author | Nikolaos Kavvadias 2011, 2012, 2013, 2014 |
| Contact | nikos@nkavvadias.com |
| Website | http://www.nkavvadias.com |
| Release Date | 26 September 2014 |
| Version | 0.1.1 |
| Rev. history | |
| v0.1.1 | 26-09-2014 Updated README and file organization for Github. Renamed COPYING.BSD to LICENSE. |
| v0.1.0 | 21-02-2014 Changed documentation format to RestructuredText. |
| v0.0.5 | 25-07-2011 First public release. |
fixed_extensions_pkg is a fixed-point arithmetic package written in VHDL according to the VHDL-2008 update of the standard. It uses VHDL-2008 back- compatible libraries (by David Bishop) that are included in this distribution for the sake of completeness.
Currently, the fixed_extensions_pkg package implements the following:
fixed_extensions is distributed along with a tool (gentestround) to generate customized VHDL test designs.
The fixed_extensions project can be downloaded either from the following OpenCores website: http://opencores.org/project,fixed_extensions or from its corresponding Github repository: http://github.com/nkkav/fixed_extensions
The fixed_extensions distribution includes the following files:
| /fixed_extensions | Top-level directory |
| AUTHORS | List of authors. |
| BUGS | Bug list. |
| ChangeLog | A log for code changes. |
| COPYING.BSD | The modified BSD license. |
| README | This file. |
| README.html | HTML version of README. |
| README.pdf | PDF version of README. |
| THANKS | Acknowledgements. |
| TODO | A list of future enhancements. |
| VERSION | Current version of the project sources. |
| rst2docs.sh | Bash script for generating the HTML and PDF versions. |
| /bench/vhdl | Benchmarks VHDL directory |
| testrounding_tb.vhd | Standard testbench file. |
| /gen/vhdl | Generated RTL VHDL code directory. |
| testroundings.vhd | Auto-generated test file for sfixed arithmetic. |
| testroundingu.vhd | Auto-generated test file for ufixed arithmetic. |
| /rtl/vhdl | RTL source code directory for the package |
| fixed_extensions_pkg- _sim.vhd | The VHDL package for simulation-oriented use. |
| /sim/rtl_sim | RTL simulation files directory |
| /sim/rtl_sim/bin | RTL simulation scripts directory |
| run.sh | A bash script for testing the package. |
| testroundings.do | Modelsim macro script for testing sfixed arithmetic. |
| testroundings.sh | Bash script for running an sfixed simulation. |
| testroundingu.do | Modelsim macro script for testing ufixed arithmetic. |
| testroundingu.sh | Bash script for running an ufixed simulation. |
| /sim/rtl_sim/src | Various source files for running RTL simulations |
| fixed_float_typ es_custom.vhd | VHDL package with definitions for fixed-point arithmetic. |
| fixed_pkg_c.vhd | VHDL package implementing fixed-point arithmetic (VHDL'93 version of the VHDL-2008 package as found http://www.eda.org/fphdl/). |
| math_real.vhd | VHDL package with some real arithmetic functions (also part of the IEEE 1076 standard for VHDL). |
| /sw | Software utilities |
| Makefile | Makefile for compiling the test design generator. |
| gentestround.c | Test design generator written in ANSI C. |
The fixed_extensions package can be used as follows. Assuming that the user has changed directory to ./fixed_extensions, the following can be used:
Alternatively, the user can only generate and run some tests for solely the signed fixed-point and unsigned fixed-point data types. This is correspondingly performed as:
and
Standard UNIX-based tools (tested on cygwin/x86)
[optional] Mentor Modelsim (mti) from http://www.model.com
Provides a simulation environment to run the tests.