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OpenFPU64
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OpenFPU64
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============================
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============================
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Peter Hüwe
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Peter Hüwe
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V.0.1, Januar 2009, License: CC-by-sa
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V.0.1, Januar 2009, License: CC-by-sa
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:author initials: PH
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:author initials: PH
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:email: peterhuewe@gmx.d
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:email: peterhuewe@gmx.de
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:license: CC-by-sa
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:license: CC-by-sa
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About OpenFPU64
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About OpenFPU64
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---------------
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---------------
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OpenFPU64 is a free and open source implementation of a double precision floating point unit.
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OpenFPU64 is a free and open source implementation of a double precision floating point unit.
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* subnormals/denormals
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* subnormals/denormals
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* validated against IEEE754 using TestFloat (http://www.jhauser.us/arithmetic/TestFloat.html)
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* validated against IEEE754 using TestFloat (http://www.jhauser.us/arithmetic/TestFloat.html)
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* Compatible with Avalon Bus
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* Compatible with Avalon Bus
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* Wishbone interface will be provided soon
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* Wishbone interface will be provided soon
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The openFPU is tested with a Cyclone II and a CycloneIII fpga.
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The openFPU64 is tested with a Cyclone II and a CycloneIII fpga.
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Overview
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--------
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The openFPU64 consists of several parts:
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* openfpu64.vhd - contains the bus logic for the avalon bus, instantiate your own algorithms here
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* fpu_package.vhd - global constants and defines
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* fpu_add.vhd - Add/Sub algorithms
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* fpu_mul.vhd - Multiplication Algorithm with several embedded Multipliers
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* fpu_mul_single.vhd - Multiplication Algorithm with only one embedded Multiplier (currently in development, has some bugs)
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To use it in the NiosII environment you have to use the driver/library in
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* nios-driver
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The testbench needs also
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* openfpu64_tb.vhd - Testframework, consists of openfpu64_tb.head.vhd, openfpu64_tb.tail.vhd and the actual testcases which reside in tests/ (untar tests.tar.bz2)
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* eis_helpers.vhd - some nice conversion functions for std_logic_vectors, provided by Prof. Dr. Gundolf Kiefer.
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Usage in QuartusII SOPC (tm)
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Usage in QuartusII SOPC (tm)
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----------------------------
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----------------------------
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In order to use openFPU64 copy all VHDL files (*.vhd) and the TCL file (openfpu64_hw.tcl) to the root directory of your QuartusII Project.
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In order to use openFPU64 copy all VHDL files (*.vhd) and the TCL file (openfpu64_hw.tcl) to the root directory of your QuartusII Project.
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(alternative: 'make quartus_distribution' and copy everything in openfpu64_quartus/ to the root directory of your Quartus II project)
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(alternative: 'make quartus_distribution' and copy everything in openfpu64_quartus/ to the root directory of your Quartus II project)
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Note:
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Note:
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-----
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-----
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QuartusII, Nios, Cyclone, QuartusII SOPC Builders are registered Trademarks of Altera Corporation, 101 Innovation Drive, San Jose, California 95134, USA. All rights reserved.
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QuartusII, Nios, Cyclone, QuartusII SOPC Builders are registered Trademarks of Altera Corporation, 101 Innovation Drive, San Jose, California 95134, USA. All rights reserved.
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Todo:
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-----
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Of course there is still a lot to do, e.g. adding more documentation.
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Meanwhile, for questions contact me at peterhuewe@gmx.de and I'm glad to help you out
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Meanwhile, for questions contact me at peterhuewe@gmx.de and I'm glad to help you out
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