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////  DES CORE                                                   ////

////                                                             ////

////  Author: Rudolf Usselmann                                   ////

////          rudi@asics.ws                                      ////

////                                                             ////

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////                                                             ////

//// Copyright (C) 2001 Rudolf Usselmann                         ////

////                    rudi@asics.ws                            ////

////                                                             ////

//// This source file may be used and distributed without        ////

//// restriction provided that this copyright statement is not   ////

//// removed from the file and that any derivative work contains ////

//// the original copyright notice and the associated disclaimer.////

////                                                             ////

////     THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     ////

//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   ////

//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   ////

//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      ////

//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         ////

//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    ////

//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   ////

//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        ////

//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  ////

//// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  ////

//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  ////

//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         ////

//// POSSIBILITY OF SUCH DAMAGE.                                 ////

////                                                             ////

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DES Core

========

Attached is a DES core implementation in verilog. It takes a standard

56 bit key and 64 bits of data as input and generates a 64 bit

encrypted/decrypted result. Two implementations are provided:

1) Area Optimized (CBC Mode)

   This is a sequential implementation and needs 16 cycles to complete

   a full encryption/decryption cycle.

2) Performance Optimized (EBC Mode)

   This is a pipelined implementation that has a 16 cycle pipeline

   (plus 1 input and 1 output register). It can perform a complete

   encryption/decryption every cycle.

Performance

===========

1) Area Optimized (CBC Mode)

   0.18u UMC ASIC process: >155Mhz 3K Gates

   Altera APEX 20KE-1: 1106 lcells >27MHz

   Altera FLEX 10K50E-1: 1283 lcells >43MHz

2) Performance Optimized (EBC Mode)

   0.18u UMC ASIC process: >290Mhz 28K Gates

   Altera APEX 20KE-1: 6688 lcells >53MHz

   Altera FLEX 10K130E-1: 6485 lcells >76 Mhz

Status

======

05-Oct-2001     Added decrypt input (Thanks to Mark Cynar for

                providing the code)

                Reorganized directory structure

                Added Makefile

                Cleaned up test benches

03-Feb-2001     Initial Release

Directory Structure

===================

[core_root]

 |

 +-doc                        Documentation

 |

 +-bench--+                   Test Bench

 |        +- verilog          Verilog Sources

 |        +-vhdl              VHDL Sources

 |

 +-rtl----+                   Core RTL Sources

 |        +-verilog           Verilog Sources

 |        +-vhdl              VHDL Sources

 |

 +-sim----+

 |        +-rtl_sim---+       Functional verification Directory

 |        |           +-bin   Makefiles/Run Scripts

 |        |           +-run   Working Directory

 |        |

 |        +-gate_sim--+       Functional & Timing Gate Level

 |                    |       Verification Directory

 |                    +-bin   Makefiles/Run Scripts

 |                    +-run   Working Directory

 |

 +-lint--+                    Lint Directory Tree

 |       +-bin                Makefiles/Run Scripts

 |       +-run                Working Directory

 |       +-log                Linter log & result files

 |

 +-syn---+                    Synthesis Directory Tree

 |       +-bin                Synthesis Scripts

 |       +-run                Working Directory

 |       +-log                Synthesis log files

 |       +-out                Synthesis Output

About the Author

================

To find out more about me (Rudolf Usselmann), please visit:

http://www.asics.ws