A fully qualified top-down and bottom-up mixed-signal design flow for non volatile memories technologies

Abstract

The wide range and rapid increase in the complexity of EDA tools demand proven and safe design flows. This paper presents a complete and fully qualified mixed-signal top-down design flow for non volatile memory applications. It has been successfully applied to an embedded flash macrocell based design as well as to a 14 bit analog/digital converter with digital non linearity compensation manufactured in 0.18 /spl mu/m proprietary flash technology. One remarkable feature of the proposed methodology is the high level of integration among EDA tools from different vendors and internally developed solutions. The mixed-signal domain has been really explored at all levels: functional, behavioural, VHDL/schematic and post layout with parasitic components. Furthermore, we propose a bottom-up methodology to generate and validate VHDL-AMS models for IP analog cells. All the illustrated features are integrated in a design flow which provides full compatibility and flexibility between analog and digital design steps to cut down time-to-design, improve time-to-market and streamline design quality.