TkGate

TkGate is a digital circuit editor and simulator with a Tcl/Tk based

interface. TkGate includes a large number of built-in devices including basic

gates, memories, ttys and modules for hierarchical design. The simulator can

be controlled either interactively or through a simulation script. Memory

contents can be loaded from files, and a microcode/macrocode compiler (gmac)

is included to create tkgate memory files from a high-level description. The

simulator supports continuous simulation, single step simulation (by clock or

epoch) and breakpoints. Save files are in a Verilog-like format.

TkGate also includes a number of tutorial and example circuits which can be

loaded through the "Help" menu. The examples range from a simple gate-level

3-bit adder to a 16-bit CPU programmed to play the "Animals" game.

TkGate has a multi-language interface with support for English, Japanese,

French and Spanish.