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. TkGate is free software provided with source code under the Gnu Public License.
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Here are some key features of "TkGate":
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:
· Basic gates (AND, OR, etc.)
· 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.
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