XSCHEM : schematic capture
and netlisting EDA tool
    
    
    
    
    Xschem is a schematic capture program, it allows creation of
    hierarchical representation of circuits with a top down approach . 
    By focusing on interfaces, hierarchy and instance properties a 
    complex system can be described in terms of simpler building blocks.
    A VHDL or Verilog or Spice netlist can be generated from 
    the drawn schematic, allowing
    the simulation of the circuit. Key feature of the program is its
    drawing engine written in C and using directly the Xlib drawing
    primitives; this gives very good speed performance, even on very
    big circuits. The user interface is built with the Tcl-Tk toolkit,
    tcl is also the extension language used.
    Features
    
      - hierarchical schematic drawings, no limits on size
- any object in the schematic can have any sort of properties
        (generics in VHDL, parameters in Spice or Verilog)
 
- new Spice/Verilog primitives can be created, and the netlist
        format can be defined by the user
- tcl extension language allows the creation of scripts; any
        user command in the drawing window has an associated tcl comand
- VHDL / Verilog / Spice netlist, ready for simulation
- Behavioral VHDL / Verilog code can be embedded as one of the
        properties of the schematic block, 
 
    Xschem runs on UNIX systems with X11 and Tcl-Tk toolkit installed.
    
    
Documentation
    
    Download
    
    License
    The software is released under
      the GNU GPL, General Public License
      
      
Contact
      Anyone interested in this project please contact me at the
      following address:
        STEFAN.SCHIPPERS@GMAIL.COM
      
    
    Software requirements:
    - X11
    - tcl-tk libs and developent files
    - c99 compiler
    - bison (only for compiling the grammar parser)
    - flex (only for compiling the lexical analyzer
    - Xpm library and -dev header files
    - awk (tested with gawk and mawk)
    
      
Systems tested:
    
    - Linux debian / Redhat
    - Solaris sparc
    - Windows (with the cygwin layer and cygwin/Xorg X11 server,
    plus the tcl/tk toolkit and the -dev libraries) 
    
    
    
    
    Screenshots
    
    
      
      
       
      
      
        
          - digital system for VHDL simulation
 
 
      
      