US5870324A
Expired / Lapsed
US
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Contents-addressable memory
Assignee: International Business Machines Corp
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Filing: 1995-04-18
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Granted: 1999-02-09
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Expires: 2015-04-18
Abstract
Abstract The invention relates to a contents-addressable memory (CAM) with multiple logical-memory arrays Di. The logical-memory arrays Di are distributed logically in multiple blocks Dij. The blocks Dij are physically arranged to memory arrays Di' and integrated on the chip surface. Each memory array Di' hereby has one block Dij of the logical memory arrays Di. In this way, parasitic capacities of the CAM may be minimized.
Inventors
- 👤 Klaus Helwig
- 👤 Christoph Wandel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:51
CPC Classifications
G; G11; G11C; G11C8/00; G11C8/12; G11C15/00; G11C15/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
A contents-addressable memory with two logical memory arrays characterized in that said contents-addressable memory is arranged on a memory chip with the logical memory arrays each logically divided into two physical memory blocks which are arranged apart on said memory array.
Claim 2
Dependent Claim
41 words
A contents-addressable memory with two logical memory arrays characterized in that said contents-addressable memory is arranged on a memory chip with the logical memory arrays each logically divided into two physical memory blocks which are arranged apart on said memory array.
Claim 3
Dependent Claim
41 words
A contents-addressable memory according to claim 1, characterized in that a match circuit is provided for each of the blocks and that the match circuits of those blocks which belong logically to the memory array are logically linked to one another.
Claim 4
Dependent Claim
22 words
A contents-addressable memory according to claim 2, characterized in that the logical linking of the match circuits is a logical AND operation.
References Cited (Backward Citations)
US5564052A
Cited
US5280447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-08 | 2002-08-10 | 2003-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-08 | 2006-08-10 | 2007-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-08 | 2010-08-10 | 2011-02-09 | $7700.00 | Window Closed / Lapsed |