Title:
WOMコードに応じてデータが記憶されるメモリ位置を具備するデータ処理装置
Document Type and Number:
Japanese Patent JP4050617
Kind Code:
B2
Abstract:
A device contains a memory that stores a WOM codeword that encodes successive generations of data values. When the codeword must be updated to represent a new data value, the device determines which updates of the dataword can be realized by feasible single bit updates to the WOM (Write Once Memory) codeword. If no feasible single bit update is possible, feasible two-bit updates are considered. Under control of the new data values a connection circuit routes feasibility signals for various updates, that signal the single-bit feasibility of the updates. Routing brings together pairs of feasibility signals for updates that together produce a WOM codeword that encodes the new data value. A pair is selected in which both feasibility signals indicate feasibility and the codeword is updated according to the updates involved in the pair. Preferably, the routing is realized with a connection circuit that comprises a number of layers of subcircuits, each routing the feasibility signals dependent on a respective bit of the new dataword. Also preferably, the WOM code is designed so that each of a number of updates to the data word can be realized by setting singles ones of a plurality of bits.
Inventors:
Egner Sebastian
Widder-Shoven Francika Peas
Widder-Shoven Francika Peas
Application Number:
JP2002550260A
Publication Date:
February 20, 2008
Filing Date:
November 27, 2001
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
G06F12/00; G11C17/00
Domestic Patent References:
| JP62090723A | ||||
| JP2000077987A | ||||
| JP2004516603A |
Foreign References:
| US4691299 | ||||
| US6308250 |
Attorney, Agent or Firm:
Kenji Sugimura
Kosaku Sugimura
Kiyoshi Kuruma
Shiro Fujitani
Tatsuya Sawada
Eiji Fujiwara
Susumu Tsugaru
Akihiko Miyazaki
Kosaku Sugimura
Kiyoshi Kuruma
Shiro Fujitani
Tatsuya Sawada
Eiji Fujiwara
Susumu Tsugaru
Akihiko Miyazaki