Hybrid memory device
First Claim
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1. A memory device comprisingfirst and second bit lines;
- a first memory cell coupled between the first and second bit lines and responsive to a first word line signal;
a second memory cell coupled between the first and second bit lines and responsive to a second word line signal, the first and second memory cells being different type of memory cells;
a first switching device coupled to at least one of the first and second bit lines to allow at least one of transfer of data to and from the first memory cell; and
a second switching device coupled to at least one of the first and second bit lines for transfer of data from the second memory cell.
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Abstract
A hybrid memory device according to the present invention has a RAM cell and a ROM cell that separately operate, and is capable of loading data in the ROM cell to the RAM cell. In such a hybrid memory device, to transfer the data in the ROM cell to common bit lines, transistors are respectively provided between the bit lines and the ROM cell. Accordingly, even when loading the data in the ROM cell to the RAM cell, the RAM and ROM cells can be separately operated.
21 Citations
31 Claims
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1. A memory device comprising
first and second bit lines; -
a first memory cell coupled between the first and second bit lines and responsive to a first word line signal; a second memory cell coupled between the first and second bit lines and responsive to a second word line signal, the first and second memory cells being different type of memory cells; a first switching device coupled to at least one of the first and second bit lines to allow at least one of transfer of data to and from the first memory cell; and a second switching device coupled to at least one of the first and second bit lines for transfer of data from the second memory cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A memory device comprising:
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first and second bit lines; a random access memory cell coupled between the first and second bit lines and responsive to a first word line signal; a read-only memory cell coupled between the first and second bit lines and responsive to a second word line signal; a first switching device coupled to at least one of the first and second bit lines to allow at least one of transfer of data to and from the random access memory cell; and a second switching device coupled to at least one of the first and second bit lines for transfer of data from the read-only memory cell. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification