Crossbar, Inc.

Lin Shih Liu

Hagop A Nazarian

Sung Hyun Jo

Mehdi Asnaashari

Sang Thanh Nguyen

Tianhong Yan

Two-terminal memory can be formed into a memory array that contains many discrete memory cells in a physical and a logical arrangement. Where each memory cell is isolated from surrounding circuitry by a single transistor, the resulting array is referred to as a 1T1R memory array. In contrast, where a group of memory cells are isolated from surrounding circuitry by a single transistor, the result is a 1TnR memory array. Because memory cells of a group are not isolated among themselves in the 1TnR case, bit disturb effects are theoretically possible when operating on a single memory cell. Read operations are disclosed for two-terminal memory devices configured to mitigate bit disturb effects, despite a lack of isolation transistors among memory cells of an array. Disclosed operations can facilitate reduced bit disturb effects even for high density two-terminal memory cell arrays.

Read operation with data latch and signal termination for 1TNR memory array

A non-volatile programmable circuit configurable to perform logic functions, is provided. The programmable circuit can employ two-terminal non-volatile memory devices to store information, thereby mitigating or avoiding disturbance of programmed data in the absence of external power. Two-terminal resistive switching memory devices having high current on/off ratios and fast switching times can also be employed for high performance, and facilitating a high density array. For look-up table applications, input/output response times can be several nanoseconds or less, facilitating much faster response times than a memory array access for retrieving stored data.

Programmable logic applications for an array of high on/off ratio and high speed non-volatile memory cells

Providing for a configuration cells for junction nodes of a field programmable gate array (FPGA) is described herein. By way of example, a configuration cell can comprise non-volatile resistive switching memory to facilitate programmable storage of data as an input to a control circuit of a junction node. The control circuit can activate or deactivate a junction node of the FPGA in response to a value of the data stored in the non-volatile resistive switching memory. The control circuit can comprise an SRAM circuit for fast operation of the junction node. Moreover, the non-volatile memory of the configuration cell facilitates fast power-up of the control circuit utilizing data stored in the resistive switching memory, and minimizes power consumption associated with storing the data.

Non-volatile resistive memory configuration cell for field programmable gate array

Providing for improved sensing of non-volatile resistive memory to achieve higher sensing margins, is described herein. The sensing can leverage current-voltage characteristics of a volatile selector device within the resistive memory. A disclosed sensing process can comprise activating the selector device with an activation voltage, and then lowering the activation voltage to a holding voltage at which the selector device deactivates for an off-state memory cell, but remains active for an on-state memory cell. Accordingly, very high on-off ratio characteristics of the selector device can be employed for sensing the resistive memory, providing sensing margins not previously achievable for non-volatile memory.

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Fremont, CA, United States of America

Lin Shih Liu