Instead of using a common substrate (101) for each sector of a flash memory, trenches are used to isolate columnar active substrate regions (304) of the substrate (101), and independent access to each of these columnar regions (304) is provided. First, the independent access to each of these columnar...http://www.google.com/patents/US6396737?utm_source=gb-gplus-sharePatent US6396737 - High density flash memory architecture with columnar substrate coding
