Event driven digital circuit simulator with a tcl/tk interface

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 Features: - Easy to use point-and-click user interface. - Customizable color configuration. - Intelligent placement and movement of wires. - Multi-bit buses. - Hierarchical design through user defined modules. - Six valued logic including 0, 1, floating, unknown, "low" and "high". - Wide range of circuit elements including: - Basic gates (AND, OR, etc.) - Switch-level NMOS and PMOS transistors - Tristate buffers - Alu components (Adders, shifters, multipliers) - Memory elements (Registers, RAMs, ROMs) - A "tty" element which allows the creation of interactive circuits. - Graphical display of simulation results. - Breakpoints, single-step and clock-step simulator control. - Includes a generic microcode/macrocode compiler for creating memory initialization files. - Simulations can be controlled through the GUI or through script files. - Verilog-like save file format. - Hyperlinks to move about in circuit or load other files. - Can be configured to use Japanese interface (see README file). - Supports static critical path analysis.

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