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US5381368A
Expired / Lapsed
US
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Hardware implemented row copy enable mode for DRAMS to create repetitive backgrounds for video images or DRAM testing
Assignee: Round Rock Research LLC
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Filing: 1993-12-10
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Granted: 1995-01-10
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Expires: 2013-12-10
Abstract
Abstract There is a hardware implemented row copy operation mode for a DRAM to relieve the VRAMs from this slower repetitive operation. In addition, by providing circuitry that will generate a solid repetitive pattern for the full or portions of the screen. Another advantage of the invention occurs during testing of a DRAM with this circuitry. By having the ability of filling the memory array with, for example all digital ones in each cell, the quality of the die can easily be tested by modifying individual cells with a digital zero. Uniquely, this circuitry relieves the testing circuitry from filling in a background of information like the all ones background. Another feature of the invention allows graphic cards that exclusively use DRAMs, to eliminate the additional circuitry needed to perform the row copy feature, or creation of backgrounds.
Inventors
- 👤 Donald M. Morgan
- 👤 Michael A. Shore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:28
CPC Classifications
G; G11; G11C; G11C7/00; G11C7/10; G11C7/1006; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/401; G11C11/4063; G11C11/407; G11C11/409; G11C11/4096; G11C29/00; G11C29/04; G11C29/08; G11C29/12; G11C29/18; G11C29/30; G11C29/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
A DRAM device, comprising: a memory array having first and second rows and a plurality of memory cells coupled to the first and second rows; and a circuit, located on the DRAM device and electrically coupled to the memory array, for copying data in the memory cells of the first row to memory cells in the second row while maintaining the data in the first row.
Claim 2
Dependent Claim
66 words
A DRAM device, comprising: a memory array having first and second rows and a plurality of memory cells coupled to the first and second rows; and a circuit, located on the DRAM device and electrically coupled to the memory array, for copying data in the memory cells of the first row to memory cells in the second row while maintaining the data in the first row.
Claim 3
Dependent Claim
139 words
A DRAM device, comprising: a memory array having multiple rows and multiple paired digit lines that intersect one another, the memory array also having a plurality of memory cells coupled at intersections of individual rows and paired digit lines, the paired digit lines being used to carry data to and from the memory cells; an equilibrate control, electrically coupled to the digit lines of the memory array, to erase data on the paired digit lines; and a copy circuit, located on the DRAM device and electrically coupled to the memory array and the equilibrate control, for copying data carried by the paired digit lines and placed in a first row of memory cells to at least another row of memory cells by suspending activation of the equilibrate control to prevent erasure of the data on the paired digit lines.
Claim 4
Dependent Claim
139 words
A DRAM device, comprising: a memory array having multiple rows and multiple paired digit lines that intersect one another, the memory array also having a plurality of memory cells coupled at intersections of individual rows and paired digit lines, the paired digit lines being used to carry data to and from the memory cells; an equilibrate control, electrically coupled to the digit lines of the memory array, to erase data on the paired digit lines; and a copy circuit, located on the DRAM device and electrically coupled to the memory array and the equilibrate control, for copying data carried by the paired digit lines and placed in a first row of memory cells to at least another row of memory cells by suspending activation of the equilibrate control to prevent erasure of the data on the paired digit lines.
Claim 5
Dependent Claim
85 words
A DRAM device, comprising: a memory array having 1) multiple rows electrically coupled to plural memory cells, and 2) equilibrate circuitry coupled to the rows; an equilibrate control circuit, electrically coupled to the equilibrate circuitry of the memory array, to enable or disable the equilibrate circuitry; and a row copy enable circuit, electrically coupled to the memory array and the equilibrate control, for copying data in a first row of memory cells to at least another row of memory cells without activating the equilibrate circuitry.
Claim 6
Dependent Claim
85 words
A DRAM device, comprising: a memory array having 1) multiple rows electrically coupled to plural memory cells, and 2) equilibrate circuitry coupled to the rows; an equilibrate control circuit, electrically coupled to the equilibrate circuitry of the memory array, to enable or disable the equilibrate circuitry; and a row copy enable circuit, electrically coupled to the memory array and the equilibrate control, for copying data in a first row of memory cells to at least another row of memory cells without activating the equilibrate circuitry.
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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) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |