Research On Library Building Of VDSM Memory

With fast developing of ultra-large-scale-integrated-circuits technology, it's update cycle is shorter and shorter. The library building technology has became the basic of design automation since the automation of design tools is more and more advanced. The fast growing of memory make it quite important for IC design. So quick parameter extraction is indispensable for memory. In order to extract the logic parameter of memory quickly and accurately, we need automatic tools to go on the parameter extraction and library building so as to reduce the man-made influence during the library building process.However, since memory circuit is very large and dense and the growing of its size is amazing, it is unpractical to extract the logic parameter directly with simulation tools. So it's necessary for us to reduce the memory circuits. The current circuit under test for parameter extraction is different from the actual one, so the parameter extraction is far from accurate enough. Nowadays, most of the work of library building is semi-automatic and so much manual work is got in producing stimuli, the parameter extraction is time-consuming, and it will also introduce error or mistake frequently.Faced with these problems, this paper presents new methods for parameter extraction of memory on the base of current research about library building technology. On the precondition that the error is acceptable, we reduce the memory circuit before we do the logic parameter extraction so as to realize extraction automation. At the same time, VCVS(Voltage-Controlled-Voltage-Source) is presented in this paper to reflect the actual situation exactly. The input stimuli is produced accurately, completely and automatically, so that the parameter extraction is more fast.