The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 2003
Filed:
Dec. 18, 1998
Yoshihiro Ishida, Chiba, JP;
Masahiro Konishi, Chiba, JP;
Kawasaki Microelectronics, Inc., Chiba, JP;
Abstract
In a binary search, two storage units are prepared so that when the least significant bit of the search address is “0” and “1”, even and odd address banks respectively are used. The search object data is classified according to data belonging to the odd and even addresses in continuous addresses and allocated to these two storage units. Further, a search tree of the search address is constructed so that two data of object for a next search are stored in different storage units. Upon the binary search, addresses for the two storage units are set according to this search tree. Therefore, simultaneous readout of data is enabled, so that readout and comparison are carried out in parallel. Further, according to multiple division search of the invention, if 2 bits of the least significant bits of the search address are “00”, “01”, “10” and “11”, a search object data is stored in first through fourth banks respectively. A search tree of the search address is constructed so that four data of object for a next search are stored in different banks. Upon a search, an address for each bank is set according to the search tree so as to enable readout of data at the same time, thereby reducing time required for the search.