an interactive graphics system for the design of integrated circuits
IGS (Interactive Graphics System) is a computer design aid specifically developed for the layout of integrated circuits. User specification of process information makes the system process-independent while retaining the features which make it a useful layout tool. The ability to place interconnect on a coarse grid greatly diminishes the chances of misalignment. Automatic, incremental checking of cell-to-cell, cell-to-component, and component-to-component spacing reduces the number of design rule violations. Rudimentary forms of topology verification are provided in the ability to trace electrical connectivity.
interaction graphics systems design integrated circuit computation layout user process informal feature tool place interconnect connection grid incremental topologies verification traces component