摘要:
A storage element can include a bottom structure having at least one edge formed by a top surface and a side surface; a programmable layer, programmable between at least two different impedance states, and formed over the at least one edge and in contact with a portion of the bottom structure; an insulating layer that extends above the top surface of the bottom structure having an opening to the bottom structure formed therein, the opening having sloped sides; and at least one top layer formed within the opening and in contact with the programmable layer. Methods of making such a storage element are also disclosed.
摘要:
Structures and methods of operating a resistive switching memory device are disclosed herein. In one embodiment, a resistive switching memory device can include: (i) a plurality of resistive memory cells, where each of the resistive switching memory cells is configured to be programmed to a low resistance state by application of a first voltage in a forward bias direction, and to be erased to a high resistance state by application of a second voltage in a reverse bias direction; and (ii) a sensing circuit coupled to at least one of the plurality of resistive memory cells, where the sensing circuit is configured to read a data state of the at least one resistive memory cell by application of a third voltage in the forward bias direction or the bias reverse direction.
摘要:
Structures and operations of a resistive switching memory device are described herein. In one embodiment, a resistive switching memory device can include: a plurality of resistive memory cells, each configured to be programmed to a low resistance state by application of a first voltage in a forward bias direction, and erased to a high resistance state by application of a second voltage in a reverse bias direction; a plurality of common plates, each being connected to a subset of the resistive memory cells; a command detector configured to detect a write command to be executed as a first and second write operations; and a write controller configured to perform the first write operation on each resistive memory cell in a selected subset, and to perform the second write operation on at least one of the resistive memory cells in the selected subset based on the detected write command.
摘要:
In one embodiment, a method of operating a resistive switching device includes applying a signal comprising a pulse on a first terminal of a two terminal resistive switching device having the first terminal and a second terminal. The resistive switching device has a first state and a second state. The pulse includes a first ramp from a first voltage to a second voltage over a first time period. The first time period is at least 0.1 times a total time period of the pulse.
摘要:
Structures and methods for encoding data to reduce write cycles in a semiconductor memory device are disclosed herein. In one embodiment, a method of writing data to a semiconductor memory device can include: (i) determining a number of significant bits for data to be written in the semiconductor memory device; (ii) determining a tag associated with the data to be written in the semiconductor memory device, where the tag is determined based on the determined number of significant bits; (iii) encoding the data when the tag has a first state, where the tag is configured to indicate data encoding that comprises using N bits of the encoded data to store M bits of the data, where M and N are both positive integers and N is greater than M; and (iv) writing the encoded data and the tag in the semiconductor memory device.
摘要:
A method of operating a resistive switching device includes applying a program stress to a two terminal resistive memory unit. The program stress is applied at a program voltage configured to change a state of the memory unit from a first state to a second state. The method further includes applying a verification/stabilization stress to the two terminal resistive memory unit. The verification/stabilization stress is applied at a verification/stabilization voltage. An erase stress is applied to the two terminal resistive memory unit. The erase stress is applied at an erase voltage configured to change a state of the memory unit from the second state to the first state. The verification/stabilization voltage is between the program voltage and the erase voltage.
摘要:
In accordance with an embodiment of the present invention, a method of operating a resistive switching device includes applying a signal including a pulse on a first access terminal of an access device having the first access terminal and a second access terminal. The second access terminal is coupled to a first terminal of a two terminal resistive switching device. The resistive switching device has the first terminal and a second terminal. The resistive switching device has a first state and a second state. The pulse includes a first ramp from a first voltage to a second voltage over a first time period, a second ramp from the second voltage to a third voltage over a second time period, and a third ramp from the third voltage to a fourth voltage over a third time period. The second ramp and the third ramp have an opposite slope to the first ramp. The sum of the first time period and the second time period is less than the third time period.
摘要:
A memory device can include at least one array comprising a plurality of elements programmable between at least two different states, each state having a different time to a change in property under applied sense conditions; a read circuit configured to apply the sense conditions to selected elements and detect changes in property of the selected elements to generate read data; a latch circuit configured to store read data from the read circuit; and a transfer path configured to provide a parallel data transfer path between the read circuit and the latch circuit.
摘要:
In accordance with an embodiment of the present invention, a resistive switching device comprises a bottom electrode, a switching layer disposed over the bottom electrode, and a top electrode disposed over the switching layer. The top electrode comprises an alloy of a memory metal and an alloying element. The top electrode provides a source of the memory metal. The memory metal is configured to change a state of the switching layer.
摘要:
A memory device can include at least two ports for transferring data to and from the memory device; and plurality of memory cells, each memory cell including at least one element programmable between different impedance states, and a plurality of access devices, each access device providing a current path between the element and a different one of the ports.