Manual: Difference between revisions
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= Introduction: What is FLOODS/FLOOPS? = | = Introduction: What is FLOODS/FLOOPS? = | ||
FLOOXS is a Technology Computer Aided Design ([http://en.wikipedia.org/wiki/Technology_CAD TCAD]) tool used for [http://en.wikipedia.org/wiki/Semiconductor_process_simulation semiconductor process modeling] and [http://en.wikipedia.org/wiki/Semiconductor_device_modeling semiconductor device modeling] that will discretize and solve a set of [http://en.wikipedia.org/wiki/Partial_differential_equation partial] and [http://en.wikipedia.org/wiki/Ordinary_differential_equation ordinary differential equations] | FLOOXS is a Technology Computer Aided Design ([http://en.wikipedia.org/wiki/Technology_CAD TCAD]) tool used for [http://en.wikipedia.org/wiki/Semiconductor_process_simulation semiconductor process modeling] and [http://en.wikipedia.org/wiki/Semiconductor_device_modeling semiconductor device modeling] that will discretize and solve a set of [http://en.wikipedia.org/wiki/Partial_differential_equation partial] and [http://en.wikipedia.org/wiki/Ordinary_differential_equation ordinary differential equations] on a 1, 2 or 3D mesh using [http://en.wikipedia.org/wiki/Numerical_analysis numerical methods] such as the Finite Element Method ([http://en.wikipedia.org/wiki/Finite_element_method FEM]) and the Finite Volume Method ([http://en.wikipedia.org/wiki/Finite_volume_method FVM]). FLOOXS is built in [http://en.wikipedia.org/wiki/C%2B%2B c++], and uses several well-known math packages such as [http://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprograms BLAS], [http://en.wikipedia.org/wiki/LAPACK LAPACK], and [http://en.wikipedia.org/wiki/Portable,_Extensible_Toolkit_for_Scientific_Computation PETSC] to handle the linear algebra. The user-interface is command-line [http://en.wikipedia.org/wiki/Tcl tcl] (tool control language), a scripting language, with additional FLOOXS-specific [[Alagator Language Description | Alagator]] commands added in. | ||
==== Scripting Languages and Command-Line Use ==== | ==== Scripting Languages and Command-Line Use ==== | ||
* [[C++]] - some discussion of what is under the hood, and how to use the gdb debugger. | * [[C++]] - some discussion of what is under the hood, and how to use the gdb debugger. | ||
* [[Tcl]] - Tool Control Language is the main scripting language used to control local variables (set), do simple calculations (expr), and accomplish basic file operations (file). It sits on top of c++ | * [[Tcl]] - Tool Control Language is the main scripting language used to control local variables (set), do simple calculations (expr), define procedures (functions or routines), and accomplish basic read/write file operations (file). It sits on top of c++ | ||
* [[Alagator]] - | * [[Alagator]] - Alagator is the scripting language created specifically for FLOOXS to describe the differential equations used in process and device simulation. It sits on top of tcl. | ||
==== General Overview of Device Simulation | ==== General Overview of Device Simulation ==== | ||
This section includes a general discussion of the governing differential equations commonly used in semiconductor device simulation (e.g. the Poisson and continuity equations) and how they are depicted in the FLOOXS Alagator script, as well as common methods for declaring boundary and initial conditions. | |||
*[[Device Simulation Overview]] | *[[Device Simulation Overview]] | ||
*[[High Level Example: p/n Diode]] | *[[High Level Example: p/n Diode]] | ||
Revision as of 18:54, 26 October 2010
This is the main page for the FLOOXS (FLOOPS and FLOODS) wiki manual. FLOOXS stands for the FLorida Object Oriented Device and Process Simulator, using the old unix wild card convention of x taking the place of either "P" or "D". The codes are built as a single executable (FLOOXS) and are configured with different sets of default variables for each purpose (FLOOPS/FLOODS). New work in the Reliability MURI is aimed at combining the codes to understand device operation driven failure modes. The goal of this wiki is to instruct new FLOOXS users how to install FLOOXS and run simulations using the FLOOXS TCAD package; serve as a repository for working FLOOXS models; and provide a convenient place for user discussion regarding both TCAD models in general as well as the FLOOXS implementation.
Organization of this Manual
This manual is broken into several sections describing the commands that make up the FLOOXS simulator; common physics models used in semiconductor process and device simulation; and working examples implementing these models in FLOOXS. Commands in the manual are documented individually in unix man-style pages for users who may already be experienced TCAD scripters. In general, it is best to start with examples that are similar to what you wish to do. The examples contain line-by-line explanations as well as links to the command descriptions for more detailed followup.
Introduction: What is FLOODS/FLOOPS?
FLOOXS is a Technology Computer Aided Design (TCAD) tool used for semiconductor process modeling and semiconductor device modeling that will discretize and solve a set of partial and ordinary differential equations on a 1, 2 or 3D mesh using numerical methods such as the Finite Element Method (FEM) and the Finite Volume Method (FVM). FLOOXS is built in c++, and uses several well-known math packages such as BLAS, LAPACK, and PETSC to handle the linear algebra. The user-interface is command-line tcl (tool control language), a scripting language, with additional FLOOXS-specific Alagator commands added in.
Scripting Languages and Command-Line Use
- C++ - some discussion of what is under the hood, and how to use the gdb debugger.
- Tcl - Tool Control Language is the main scripting language used to control local variables (set), do simple calculations (expr), define procedures (functions or routines), and accomplish basic read/write file operations (file). It sits on top of c++
- Alagator - Alagator is the scripting language created specifically for FLOOXS to describe the differential equations used in process and device simulation. It sits on top of tcl.
General Overview of Device Simulation
This section includes a general discussion of the governing differential equations commonly used in semiconductor device simulation (e.g. the Poisson and continuity equations) and how they are depicted in the FLOOXS Alagator script, as well as common methods for declaring boundary and initial conditions.
Installation
- Installation on Ubuntu - Notes from a 64-bit Ubuntu 9.10 (Karmic Koala) current version FLOOXS installation with both Intel and AMD processors on 3/29/2010.
- Installation on RedHat - (this version is outdated). Installation help and notes created as I did a clean install on a RedHat linux system. Your mileage may vary.
Running FLOOXS
- Startup Script - set environment variables and alias paths
- FLOOXS within FLOOXS - use the FLOOXS command line to run another instance of FLOOXS
Workflow: How to create a FLOOXS simulation from scratch
1. Grid Generation
These are worked examples of grid generation concepts. Build 1D, 2D, and 3D structures for simulation.
- Defining a Grid - 1D, 2D, and 3D
- Gas - is an automatically generated material. Where does floods put it?
- What is a .str file? - explanation of the format of the structure file
- Adaptive Gridding - new
3. Add Solution Variables
Includes a general discussion of declaring variables in FLOOXS, including "pde" vs. "const," and "solution" vs. "sel z=" vs. "set."
4. Add Process or Device Models
- Process Models - FLOOPS
- Device Models - FLOODS
5. Solve
- Process Solves - FLOOPS
- Device Solves - FLOODS
6. Post Processing (print or plot results)
Although not as fancy as commercial tools, there are a wide range of ways to examine output results. Examples of analysis can be found in this section.
- Selection Examples
- Printing Examples
- Plotting Examples - new short version
- Tecplot - For UF SWAMP Group / TEC users only
Troubleshooting
Convergence: Having problems with solution convergence? If so, refer to this convergence FAQ page.
Check All Your Equations - Use this PrintEqns procedure
Full FLOOXS Examples
These are good introductory problems for beginners. Being able to work through these will introduce most simple concepts to users.
- Device Examples
- Process Examples - Homework Problems
- Complex Examples - Complex Examples for device and process
Command Reference Library
This contains a command reference, in Unix man page style for each command in the program.
Development
- New Developments - A brief list of the new enhancements since the last release.
- Bugs - A list of current FLOOXS Bugs that need action
- "To Do" List - Needed code enhancements for specific actions: all FLOOXS users are encouraged to contribute ideas.
Copyright and Redistribution
This software and manual is copyrighted by the Mark Law, University of Florida Electrical and Computer Engineering department. It is intended for internal educational and research and development purposes only. Any use of any part of this software in any commercial package needs to be negotiated separately. Several of the implant models are copyrighted by Al Tasch from The University of Texas at Austin.
The UMFPACK package is copyrighted by Tim Davis, University of Florida, Computer and Information Sciences Department. (davis@cis.ufl.edu). Please contact Tim directly about redistribution of the UMFPACK software.
The tcl/tk package is in the public domain, and was developed by John Ousterhout at the University of California Berkeley.
Various included linear algebra packages are also public domain.
Contributors
Faculty
- Mark Law, University of Florida
Ph.D Students
- Daniel Cummings - 2010 - danieljc@ufl.edu (Device Simulation: Strained-Si, Single-Event Effects)
- David Horton - 2010 - email
- Nicole Rowsey - 2011 - nrowsey at ufl.edu (Device Simulation: Total Dose Radiation Effects, MOS-Based Quantum Dot / Charge Qubit Devices, Multi-Gate Devices)
- Ben Gilstad - 2012 - email
- Ashish Kumar - 2013 - email
Post-Docs
- Michelle Griglione - email
- Erin Patrick - email
Intel Development Team
Martin Giles, Stephen Cea, Hal Kennel, Aaron Lilak, and Patrick Keys. Intel is feeding back bug fixes and enhancements. Steve Morris - we miss you!
Collaborators
Rex Lowther, Harris. Grid and diffusion discretizations, Cylindrical Coordinates; Mike Morris, Steve Morris, Al Tasch, University of Texas, Austin. Dual pearson implant models for boron, bf2, and arsenic; Goodwin Chin, IBM. Original ideas for hierarchical mesh; Tim Davis, University of Florida. UMF factorization code.
Recent Research Group Publications
Archive Section (Old Manual)
Getting started with Wiki
Consult the User's Guide for information on using the wiki software.