Contents addressable memory with hierarchically structured hit lines and with a on the conversion of decimal in blocks of bits search function based

摘要

PROBLEM TO BE SOLVED: To reduce a required entry number and improve the memory capacity of a TCAM by memorizing efficiently an IP address of which a range is specified.;SOLUTION: One of typical means of this invention is as follows. Namely, memory information (entry) and input information (comparison information or a retrieval key) are made common block codes in which either bit surely serves as a logical value '1'. A match line is made a hierarchical structure and a memory cell is arranged at an intersection of a plurality of sub-match lines and a plurality of search lines. Furthermore, the sub-match line is connected to each main match line through a sub-match determination circuit, and a main match determination circuit is arranged for the main match line.;COPYRIGHT: (C)2005,JPO&NCIPI