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:
Dec. 16, 2003
Filed:
Jun. 09, 2000
Kenshin Yamada, Tokyo, JP;
NEC Corporation, Toyko, JP;
Abstract
A communication control unit is provided which is capable of retrieving a path regardless of a length of an address to be retrieved, of reducing a scale of its circuit, of achieving a high speed processing of retrieval and of preventing an increase in memory size required. The communication control unit is composed of a retrieval data managing circuit adapted to represent a node of a path tree corresponding to a path table by a split address obtained by setting-off a real address by one byte and a split mask length and to produce an address comparison byte composed of four stages obtained by setting-off a retrieving address by one byte and a next node selection byte, a nex-node selecting circuit adapted to decide a node to be retrieved next based oil the next node selection byte and a path retrieving circuit adapted to compare valid address portion showing a split mask length out of the split address with a split mask length portion of the address comparison byte.