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US 10,854,291 B2Granted
Backup and/or restore of a memory circuit
AssigneeArm Limited
InventorsAkhilesh Ramlaut Jaiswal, Mudit Bhargava, George McNeil Lattimore
Life of this patent
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Abstract
Briefly, embodiments of claimed subject matter relate to backup of parameters, such as binary logic values, stored in nonvolatile memory, such as one or more SRAM cells. Binary logic values from a SRAM cell, for example, may be stored utilizing resistance states of a magnetic random-access memory (MRAM) element. Parameters stored in one or more MRAM elements may be restored to SRAM memory cells following a backup.
Claims6
A method of performing a backup of a static random-access memory (SRAM) cell, comprising:
- applying a SRAM cell supply voltage to the SRAM cell;
- applying a word-line voltage to first and second access transistors to enable conduction of an electrical current through the first and second access transistors, wherein the first access transistor is configured to electrically couple a first bit-line to a first non-volatile memory element, and wherein the second access transistor is configured to electrically couple a second bit-line to a second non-volatile memory element;
- applying, to the first bit-line coupled to a first input node of the SRAM cell and to a second bit-line coupled to the second input node of the SRAM cell, a voltage equal to a fraction of the SRAM cell supply voltage;
- responsive to applying the fraction of the SRAM cell supply voltage, storing, in the first nonvolatile memory element coupled between the first access transistor and the first input node of the SRAM cell, a first binary logic value from the SRAM cell;
- and
- responsive to applying the fraction of the SRAM cell supply voltage, storing, in the second nonvolatile memory element coupled between the second access transistor and the second input node of the SRAM cell, a second binary logic value from the SRAM cell;
- and
- boosting the SRAM cell supply voltage by an amount approximately equal to about 20.0% to about 50.0% of a normal operating value of the SRAM cell supply voltage.
5 more elements
Dependencies are inferred from the claim text.