Resistive memory arrangement
View Patent ↗Provided is a resistive memory arrangement having a cell array structured in rows and columns and having resistive memory cells connected to a drive element for driving. Each drive element is jointly connected to n cell resistors forming a memory cell, the cell resistors being CBRAM resistance elements, in particular, and also to a writing, reading and erasing method for a resistive memory arrangement realized with CBRAM resistance elements.
1. A method for writing to a CBRAM resistance element of a resistive memory arrangement having a cell array structured in rows and columns with resistive memory cells connected to a drive element, each drive element jointly being connected to a plurality of CBRAM resistive elements forming a memory cell, the method comprising;
opening a word line of a corresponding memory cell;
placing all plate lines and bit lines of unselected resistance elements at a specific plate potential;
increasing the plate line voltage of a selected resistance element by a specific write voltage; and
decreasing the voltage of an associated bit line by the write voltage.
2. The method of claim 1 , further including decreasing the bit line voltage of a plurality of bit lines by the write voltage for parallel writing to a plurality of resistance elements on the selected plate line.
3. The method of claim 2 , wherein a diode is connected in series with the CBRAM resistance elements, the method further including increasing the write voltage.
4. The method of claim 3 , wherein the diode is forward biased, and wherein the write voltage is increased by the forward bias voltage of the diode.
5. The method of claim 3 , wherein the diode is breakdown biased, and wherein the write voltage is increased by the breakdown voltage of the diode.
6. The method of claim 1 , wherein the write voltage is about 150 mV.
7. A method for reading a CBRAM resistance element of a resistive memory arrangement having a cell array structured in rows and columns with resistive memory cells connected to a drive element, each drive element jointly being connected to a plurality of CBRAM resistive elements forming a memory cell, the method comprising:
opening a word line of a corresponding memory cell;
holding the voltage of a bit line of a selected memory cell at a specific plate potential;
placing the voltage on a plate line of a resistance element to be read at a specific read voltage;
holding all plate lines and bit lines nonselected resistance elements at the plate potential; and
detecting a sense current flowing trough the resistance element in accordance with a programming state thereof.
8. The reading method of claim 7 , further including holding additional bit lines at plate potential for parallel reading of a plurality of resistance elements lying on the same word line and plate line connected in parallel to a sense circuit.
9. The method of claim 7 , wherein the read voltage is approximately 100 mV above the plate potential.
10. A method for erasing a CBRAM resistance element of a resistive memory arrangement having a cell array structured in rows and columns with resistive memory cells connected to a drive element, each drive element jointly being connected to a plurality of CBRAM resistive elements forming a memory cell, the method comprising:
opening a word line corresponding to a memory cell with a resistance element to be erased;
placing all plate lines and bit lines of unselected resistance elements at a specific plate potential;
reducing a plate line voltage of the selected resistance element by a specific erase voltage; and
increasing the voltage of the associated bit line by the erase voltage.
11. The method of claim 10 , wherein a diode is connected in series with the CBRAM resistance elements, the method further including increasing the erase voltage.
12. The method of claim 11 , wherein the diode is forward biased, and wherein the write voltage is increased by the forward bias voltage of the diode.
13. The method of claim 11 , wherein the diode is breakdown biased, and wherein the write voltage is increased by the breakdown voltage of the diode.
14. A method for operating a resistive memory amusement having a cell array structured in rows and columns with resistive memory cells connected to a drive element, each drive element jointly being connected to a plurality of CBRAM resistive elements forming a memory cell, the method comprising:
activating a word line of a column;
driving plate lines of the column which are connected to cell resistors of the resistive memory cells successively by means of a counter, in that, during a reading process, information of the successively driven cell resistors of the memory cells of the column is read out via bit lines and buffer-stored in a buffer register and output as an entire page; and
during a writing process, externally arriving write data of a page are buffer-stored in the buffer register, the corresponding word line of a column is activated and the write data buffer-stored in the buffer register are written sequentially, beginning with the first plate line up to the last plate line, to the cell resistors of the memory cells of the column.
15. A method for parallel erasure of all resistance elements connected to a drive element along a word line in a resistive memory arrangement having a cell array structured in rows and columns with resistive memory cells connected to a drive element, each drive element jointly being connected to a plurality of CBRAM resistive elements forming a memory cell, the method comprising:
opening word lines corresponding to the memory cells with the resistance elements to be erased;
placing all plate lines and bit lines of unselected resistance elements at a specific plate potential;
holding the voltages on plate lines of the selected cells at the plate potential; and
increasing the voltage on the corresponding bit lines by a specific erase voltage.