TkGate

http://www.tkgate.org/

TkGate is a event driven digital circuit simulator with a tcl/tk-based graphical editor. TkGate supports a wide range of primitive circuit elements as well as user-defined modules for hierarchical design.

The distribution comes with a number of tutorial and example circuits which can be loaded through the “Help” menu. The example circuits include a simple CPU, programmed to run the Animals game.

For more information, check out the documentation. TkGate is free software provided with source code under the Gnu Public License.

• Graphical circuit design
• Hierarchical design through user defined modules.
• Easy to use point-and-click user interface.
• Create hyperlinks to move about in circuit or load other files.
• Multi-lingual interface (Catalan, English, French, German, Japanese, Spanish, Welsh)
• Verilog-like save file format.
• Logic simulation
• Control through the GUI or through script files.
• Suitable for simulation at transistor, gate or register transfer level.
• Six valued logic model including 0, 1, floating, unknown, “low” and “high”.
• Support for custom delay models.
• Graphical display of simulation results.
• Breakpoints, single-step and clock-step simulator control.
• Static critical path analysis
• Primitive circuit elements include:
• Switch-level NMOS and PMOS transistors
• Tristate buffers
• Alu components (Adders, shifters, multipliers)
• Memory elements (Registers, RAMs, ROMs)
• An interactive “tty” element allows design of circuits that can interact with the user.
• Support tools include a microcode/macrocode compiler to assist in creating large projects such as microprocessor designs.