Global patent index - EP 0970430 A1

EP 0970430 A1 2000-01-12 - METHOD FOR IMPLEMENTING AN ASSOCIATIVE MEMORY BASED ON A DIGITAL TRIE STRUCTURE

Title (en)

METHOD FOR IMPLEMENTING AN ASSOCIATIVE MEMORY BASED ON A DIGITAL TRIE STRUCTURE

Title (de)

VERFAHREN ZUR EINRICHTUNG EINES ASSOZIATIVEN SPEICHERS AUF BASIS EINER DIGITALEN BAUMSTRUKTUR

Title (fr)

MISE EN OEUVRE D'UNE MEMOIRE ASSOCIATIVE SUR LA BASE D'UNE STRUCTURE NUMERIQUE ARBORESCENTE

Publication

EP 0970430 A1 (EN)

Application

EP 98908122 A

Priority

  • FI 9800191 W
  • FI 971066 A

Abstract (en)

[origin: WO9841932A1] The invention relates to a method for implementing a memory. The memory is implemented as a directory structure comprising a tree-shaped hierarchy having nodes at several different levels, wherein an individual node can be (i) a trie node comprising an array wherein an individual element may contain the address of a lower node in the tree-shaped hierarchy and wherein an individual element may also be empty, or (ii) a bucket containing at least one element so that the type of an individual element in the bucket is selected from a group including a data unit, a pointer to a stored data unit, a pointer to another directory structure and another directory structure. To minimize storage space requirement, the arrays in the trie nodes are implemented as quad nodes having a fixed size of four elements, and in at least part of the directory structure sets of successive quad nodes are replaced with compressed nodes in such a way that an individual set made up by successive quad nodes, from each of which there is only one address to a quad node at a lower level, is replaced with a compressed node (CN) storing an address to the quad node that the lowest node in the set to be replaced points to, information on the value of the search word by means of which said address is found, and information on the total number of bits from which search words are formed in the set to be replaced. The invention also relates to a structure in which buckets are not employed.

IPC 1-7 (main, further and additional classification)

G06F 17/30

IPC 8 full level (invention and additional information)

G06F 17/30 (2006.01)

CPC (invention and additional information)

G06F 17/30982 (2013.01)

Citation (search report)

See references of WO 9841932A1

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

WO 9841932 A1 19980924; WO 9841932 A8 19990603; AU 6623998 A 19981012; EP 0970430 A1 20000112; FI 102425 B1 19981130; FI 102425 B 19981130; FI 971066 A0 19970314; FI 971066 A 19980915

INPADOC legal status

2004-01-21 [18W] WITHDRAWN

- Effective date: 20031127

2002-03-13 [RAP1] TRANSFER OF RIGHTS OF AN EP APPLICATION

- Owner name: NOKIA CORPORATION

2000-01-12 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19990830

2000-01-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB