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US4945513A
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Gate array device
Assignee: Mitsubishi Electric Corp
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Filing: 1988-10-17
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Granted: 1990-07-31
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Expires: 2008-10-17
Abstract
Abstract A gate array device having an independent memory array region is disclosed. Only memory cells are disposed in the memory array region. Peripheral circuits for accessing the memory arrays such as an address decoder, sense amplifier and address buffer are formed of basic cells in a basic cell region. The unique arrangement of the gate array device permits a flexible selection of word and bit length of the memory array and an effective use of the memory array region.
Inventors
- 👤 Masahiro Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:35
CPC Classifications
G; G11; G11C; G11C5/00; G11C5/02; G11C5/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
A gate array device comprising: a memory array region comprising a plurality of memory cells for storing data signals; an input-output buffer means region for transferring to and from said memory cells said data signals and address signals for designating said memory cells; a basic cell region including a plurality of basic cells each comprising a first field effect device of one conductive type and a second field effect device of the opposite conductive type; access means comprising and plurality of basic cells in said basic cell region for accessing said memory cells in response to said address signals, said access means being connected between said input-output buffer means and said memory cells.
Claim 2
Dependent Claim
113 words
A gate array device comprising: a memory array region comprising a plurality of memory cells for storing data signals; an input-output buffer means region for transferring to and from said memory cells said data signals and address signals for designating said memory cells; a basic cell region including a plurality of basic cells each comprising a first field effect device of one conductive type and a second field effect device of the opposite conductive type; access means comprising and plurality of basic cells in said basic cell region for accessing said memory cells in response to said address signals, said access means being connected between said input-output buffer means and said memory cells.
Claim 3
Dependent Claim
51 words
A gate array device according to claim 1 wherein said access means comprises decoder means connected to be supplied with said address signals from said input-output buffer means for decoding said address signals, and memory cells in said memory cell array are designated by the signals decoded by said decoder means.
Claim 4
Dependent Claim
36 words
A gate array device according to claim 2 wherein said access means further comprises address buffer means connected between said input-output buffer means and said decoder means to receive address signals from said input-output buffer means.
Claim 5
Dependent Claim
27 words
A gate array device according to claim 3 wherein said decoder means comprises NAND gate means connected to receive said address signals from said address buffer means.
Claim 6
Dependent Claim
40 words
A gate array device according to claim 1 wherein said access means comprises sense amplifier means connected to be supplied with data signals from the memory cells in said memory array for amplifying data signals stored in said memory cells.
Claim 7
Dependent Claim
22 words
A gate array device according to claim 1 wherein said one conductive type is P-channel and said opposite conductive type is N-channel.
References Cited (Backward Citations)
US4562453A
Cited
US4791607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |