US4752915A
Expired / Lapsed
US
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Two dimensionally addressable memory apparatus with bank switching
Assignee: Hitachi Ltd
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Filing: 1985-08-16
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Granted: 1988-06-21
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Expires: 2005-08-16
Abstract
Abstract A memory apparatus is managed by two-dimensional addresses consisting of X and Y addresses and is divided into a plurality of memory banks. One of the memory banks is selected by lower significant bits including the least significant bit in each of the X and Y addresses. A different memory bank is selected by the updating of the X address or by the updating of the Y address.
Inventors
- 👤 Kenji Suzuki
- 👤 Hiroshi Mochizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:26
CPC Classifications
G; G11; G11C; G11C8/00; G11C8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A memory apparatus which is managed by two-dimensional addresses consisting of X and Y addresses, comprising: a memory divided into a plurality of memory banks; address registers into which X and Y addresses to access each of said memory banks of said memory are set; and bank switching control means for selecting one of said memory banks, including an exclusive OR gate connected to receive the least significant bit in each of said X and Y addresses and selection means for selecting a different memory bank in response to an output of said exclusive OR gate whenever either one of the X and Y addresses is changed.
Claim 2
Dependent Claim
107 words
A memory apparatus which is managed by two-dimensional addresses consisting of X and Y addresses, comprising: a memory divided into a plurality of memory banks; address registers into which X and Y addresses to access each of said memory banks of said memory are set; and bank switching control means for selecting one of said memory banks, including an exclusive OR gate connected to receive the least significant bit in each of said X and Y addresses and selection means for selecting a different memory bank in response to an output of said exclusive OR gate whenever either one of the X and Y addresses is changed.
References Cited (Backward Citations)
US3916169A
Cited
US4051457A
Cited
US4074254A
Cited
US4153950A
Cited
US4410965A
Cited
US4585220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |