US5220518A
Expired / Lapsed
US
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Integrated circuit memory with non-binary array configuration
Assignee: NXP BV
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Filing: 1991-10-25
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Granted: 1993-06-15
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Expires: 2011-10-25
Abstract
Abstract Memory arrays of non-binary physical dimensions are disclosed. A novel addressing scheme provides that multiple word lines are activated in response to each received address code. Generally, at least two physical block rows containing blocks of an addressed logical block row are activated in response to each address. Block rows containing redundant blocks are activated in response to every address. In a specific embodiment, a 1 M-bit array arranged in 11 rows of blocks and 6 columns of blocks functions as an 8×8 block logical array, with two blocks available for redundancy. The availablity of non-binary physical arrays affords a designer new flexibility in meeting packaging constraints and redundancy specifications.
Inventors
- 👤 Ejaz U. Haq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:44
CPC Classifications
G; G11; G11C; G11C8/00; G11C8/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A memory device comprising: a physical array of memory cells, said array having p physical cell rows and q physical cell columns, where 2 m <p<2 m+1 and 2 n <q<2 n+1 , where m, n, p, and q are positive integers, and 2 m+n+1 <p·q; data port means for communication between said memory cells and a host system; address input means for receiving address codes from said host system; and address decoding means for decoding each of said address codes so that each address code selects a respective set of said cells for communication with said host system via said data port means.
Claim 2
Dependent Claim
104 words
A memory device comprising: a physical array of memory cells, said array having p physical cell rows and q physical cell columns, where 2 m <p<2 m+1 and 2 n <q<2 n+1 , where m, n, p, and q are positive integers, and 2 m+n+1 <p·q; data port means for communication between said memory cells and a host system; address input means for receiving address codes from said host system; and address decoding means for decoding each of said address codes so that each address code selects a respective set of said cells for communication with said host system via said data port means.
Claim 3
Dependent Claim
22 words
A memory device as recited in claim 1 wherein r=p·q-2 m+n+1 cells are redundant cells and 2 m+n+1 cells are normal cells.
Claim 4
Dependent Claim
81 words
A memory device as recited in claim 2 wherein said address decoding means defines a logical array of 2 m logical cell rows and 2 n+1 logical cell columns, said logical array including said normal cells, said address decoding means having row activation means for activating at least two physical cell rows in response to each address code, said at least two physical cell rows including a cell of a logical cell row which is selected by a given address code.
Claim 5
Dependent Claim
41 words
A memory device as recited in claim 3 wherein said row activation means activates at least one physical cell row containing at least two normal cells from different logical cell rows and a redundant cell in response to each address code.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |