US4875190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-dimensional memory unit having a 2d array of individually addressable blocks each having a 2d array of cells
Assignee: Ricoh Co Ltd
•
Filing: 1987-12-21
•
Granted: 1989-10-17
•
Expires: 2007-12-21
Abstract
Abstract A two-dimensional memory unit allowing two-dimensional data to be written and read along different axes. Memory blocks having numerous memory cells arranged along each of the axes, are located at respective memory addresses, and a number of such memory blocks are arranged along the respective axes. All the memory cells of any of the memory blocks are accessed at the same time. The memory cells for actually inputting and outputting data are selected by data input and ouput controls. Data are written or read out of all of the number of memory cells in a two-dimensional small area by one memory access and, therefore, rapidly with no regard to the direction of scanning which occurs along any of the different axes.
Inventors
- 👤 Yukio Sakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:03
CPC Classifications
G; G11; G11C; G11C8/00; G11C8/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
189 words
A two-dimensional memory device comprising: memory block means comprising a plurality of individually addressable memory blocks, each memory block having a plurality of memory cells arranged along each of at least two axes in at least one of a square and a non-square array of selectable dimensions; memory block assembly means comprising a plurality of said memory block means arranged along each of at least two axes; address information generating means for generating address information for at least one of a data reading and a data writing cycle with respect to each of said axes of said memory block assembly means, and control means for selectively causing said address information with respect to each respective memory block means simultaneously access all memory cells of said respective memory block means during at least one of said data writing and data reading cycle; and data input and output control means for performing selection control on data which are inputted or outputted from a memory cell group of a respective memory block means which is accessed by said address information generating means during at least one of data writing and data reading.
Claim 2
Dependent Claim
189 words
A two-dimensional memory device comprising: memory block means comprising a plurality of individually addressable memory blocks, each memory block having a plurality of memory cells arranged along each of at least two axes in at least one of a square and a non-square array of selectable dimensions; memory block assembly means comprising a plurality of said memory block means arranged along each of at least two axes; address information generating means for generating address information for at least one of a data reading and a data writing cycle with respect to each of said axes of said memory block assembly means, and control means for selectively causing said address information with respect to each respective memory block means simultaneously access all memory cells of said respective memory block means during at least one of said data writing and data reading cycle; and data input and output control means for performing selection control on data which are inputted or outputted from a memory cell group of a respective memory block means which is accessed by said address information generating means during at least one of data writing and data reading.
Claim 3
Dependent Claim
75 words
A memory device as claimed in claim 1, wherein said data input and output control means comprises selector means for selectively outputting, among two-dimensional data read out of any of said memory block means, one row or one column of data in response to a control signal which specifies a scanning direction, and switching control means for switching said row or said column selected by said selector means in synchronism with a scanning synchronizing signal.
Claim 4
Dependent Claim
88 words
A memory device as claimed in claim 1, wherein said address information generating means comprises first counter means for generating address information with respect to first one of said axes of said memory block assembly means, second counter means for generating address information with respect to second one of said axes, and address switching means for replacing a main scanning synchronizing signal and a subscanning synchronizing signal, which are applied to said first and second counter means, in response to a control signal which specifies a scanning direction.
Claim 5
Dependent Claim
37 words
A memory device as claimed in claim 3, wherein at least one of said first and second counters comprises presetting means for presetting a value of an address which is to be initially generated by said counter.
Claim 6
Dependent Claim
51 words
A memory device as claimed in claim 1, wherein said data input and output control means comprises at least one of serial-to-parallel converting means connected to daa input terminals of said memory block means, and parallel-to-serial converting means for converting parallel data outputted by said memory block means into serial data.
Claim 7
Dependent Claim
51 words
A memory device as claimed in claim 2, wherein said data input and output control means comprises at least one of serial-to-parallel converting means connected to data input terminals of said memory block means, and parallel-to-serial converting means for converting parallel data outputted by said memory block means into serial data.
Claim 8
Dependent Claim
51 words
A memory device as claimed in claim 3, wherein said data input and output control means comprises at least one of serial-to-parallel converting means connected to data input terminals of said memory block means, and parallel-to-serial converting means for converting parallel data outputted by said memory block means into serial data.
Claim 9
Dependent Claim
51 words
A memory device as claimed in claim 4, wherein said data input and output control means comprises at least one of serial-to-parallel converting means connected to data input terminals of said memory block means, and parallel-to-serial converting means for converting parallel data outputted by said memory block means into serial data.
References Cited (Backward Citations)
US4675849A
Cited
US4644503A
Cited
US4701885A
Cited
JPS61173354A
Cited
US4740927A
Cited
US4742474A
Cited
US4757473A
Cited
US4740923A
Cited
US4773048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |