Common Data Base Schema for Hierarchical Very Large-Scale Integration Design
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
VLSI (very large-scale integration) design presents storage and design tool problems due to databases that have flat structure and make no provision for representing incremental changes as the design progresses. A method is described which solves these problems with an hierarchical representation containing only pertinent data which may be incrementally specified. VLSI design presents storage and design tool problems due to the large volume of data commonly manipulated. Existing databases, such as Physical Work Files (PWFs), Collection of Indexable Data (CIDs), and Interactive Technology Files (ITFs) of the Engineering Design System (EDS), are satisfactory for up to roughly 20K circuits. Beyond this size their structure and data representation exacerbate the storage problem severely.