automatic ecl lsi design
A complete software system for the automatic design of Emitter Coupled Logic (ECL) LSI circuits is described. It is based on the Standard Cell Array (SCA) principle where pre-designed sub-circuits or cells are placed and tracked on silicon to form the integrated circuit chip. ECL technology, (11 masks, 2 - layer metal) presents many problems not encountered in simpler processes. For example, through-holes may not be created over oxide steps and the high power dissipation of ECL cells makes the distribution of power a critical factor. This paper describes how the complexity may be turned to advantage, especially in tracking. Examples are presented to show how the various difficulties may be overcome.
design completeness software systems logic circuits standard cell arrays tracking integrability technologies layer process examples power dissipation power distributed critic factor paper complexity