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US 9,792,972 B2Granted
Memory system and cache memory
AssigneeKabushiki Kaisha Toshiba
InventorsHiroki Noguchi, Shinobu Fujita
Life of this patent
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Abstract
A memory system has a non-volatile memory including a plurality of circuit blocks using different voltages, a power-off switch circuitry that switches whether or not voltage supply to each of the plurality of circuit blocks in the non-volatile memory is cut off, and a power-off controller that controls the switching of the power-off switch circuitry based on at least one of circuit volumes of the plurality of circuit blocks, standby power of the plurality of circuit blocks, and a circuit volume of the power-off switch circuitry.
Claims16
A memory system, comprising:
- a non-volatile memory including a plurality of circuit blocks using different voltages;
- a power-off switch circuitry that switches whether or not voltage supply to each of the plurality of circuit blocks in the non-volatile memory is cut off;
- and
- a power-off controller that controls the switching of the power-off switch circuitry based on operation frequencies of the plurality of circuit blocks and at least one of circuit volumes of the plurality of circuit blocks, standby power of the plurality of circuit blocks, or a circuit volume of the power-off switch circuitry,
- wherein the non-volatile memory comprises a plurality of memory banks each of which comprises the plurality of circuit blocks,
- the power-off switch circuitry switches whether or not the voltage supply to the plurality of circuit blocks in the memory bank is cut off for the memory bank, and
- the power-off controller comprises a storage that holds access information for a memory bank in which the voltage supply is cut off.
4 more elements
A memory system, comprising:
- a non-volatile memory including a plurality of circuit blocks using different voltages;
- a power-off switch circuitry that switches whether or not voltage supply to each of the plurality of circuit blocks in the non-volatile memory is cut off;
- and
- a power-off controller that controls the switching of the power-off switch circuitry based on at least one of circuit volumes of the plurality of circuit blocks, standby power of the plurality of circuit blocks, and a circuit volume of the power-off switch circuitry,
- wherein the power-off controller comprises:
- a power-off order controller that controls a power-off order of the plurality of voltages using a predetermined state machine in which state transition is set based on parameters,
- a parameters storage that stores the parameters, and
- a parameters setting circuitry that sets the parameters in the power-off order controller.
5 more elements
A memory system, comprising:
- a non-volatile memory including a plurality of circuit blocks using different voltages;
- a power-off switch circuitry that switches whether or not voltage supply to each of the plurality of circuit blocks in the non-volatile memory is cut off;
- and
- a power-off controller that controls the switching of the power-off switch circuitry based on at least one of circuit volumes of the plurality of circuit blocks, standby power of the plurality of circuit blocks, and a circuit volume of the power-off switch circuitry,
- wherein the power-off controller cuts off supply of a voltage to a first circuit block having a first circuit volume before cutting off supply of a voltage to a second circuit block, the second circuit block having a second circuit volume larger than the first circuit volume.
2 more elements
A memory system, comprising:
- a non-volatile memory including a plurality of circuit blocks using different voltages;
- a power-off switch circuitry that switches whether or not voltage supply to each of the plurality of circuit blocks in the non-volatile memory is cut off;
- and
- a power-off controller that controls the switching of the power-off switch circuitry based on at least one of circuit volumes of the plurality of circuit blocks, standby power of the plurality of circuit blocks, and a circuit volume of the power-off switch circuitry,
- wherein the power-off controller cuts off voltage supply to a common ground of the plurality of circuit blocks, in a last order among the different voltages.
2 more elements
A cache memory, comprising:
- a data cache that stores data and comprises a non-volatile memory comprising a plurality of circuit blocks using different voltages;
- a tag that stores address information of the data stored in the data cache;
- a power-off switch circuitry that switches whether or not voltage supply to each of the plurality of circuit blocks in the non-volatile memory is cut off;
- and
- a power-off controller that controls the switching of the power-off switch circuitry based on at least one of circuit volumes of the plurality of circuit blocks, standby power of the plurality of circuit blocks, and a circuit volume of the power-off switch circuitry,
- wherein the power-off controller cuts off supply of a voltage to a first circuit block having a first circuit volume before cutting off supply of a voltage to a second circuit block, the second circuit block having a second circuit volume larger than the first circuit volume.
3 more elements
A cache memory, comprising:
- a data cache that stores data and comprises a non-volatile memory comprising a plurality of circuit blocks using different voltages;
- a tag that stores address information of the data stored in the data cache;
- a power-off switch circuitry that switches whether or not voltage supply to each of the plurality of circuit blocks in the non-volatile memory is cut off;
- and
- a power-off controller that controls the switching of the power-off switch circuitry based on at least one of circuit volumes of the plurality of circuit blocks, standby power of the plurality of circuit blocks, and a circuit volume of the power-off switch circuitry,
- wherein the power-off controller cuts off voltage supply to a common ground of the plurality of circuit blocks, in a last order among the different voltages.
3 more elements
A cache memory, comprising:
- a data cache that stores data and comprises a non-volatile memory comprising a plurality of circuit blocks using different voltages;
- a tag that stores address information of the data stored in the data cache;
- a power-off switch circuitry that switches whether or not voltage supply to each of the plurality of circuit blocks in the non-volatile memory is cut off;
- and
- a power-off controller that controls the switching of the power-off switch circuitry based on operation frequencies of the plurality of circuit blocks and at least one of circuit volumes of the plurality of circuit blocks, standby power of the plurality of circuit blocks, or a circuit volume of the power-off switch circuitry,
- wherein the non-volatile memory comprises a plurality of memory banks each of which comprises the plurality of circuit blocks,
- the power-off switch circuitry switches whether or not the voltage supply to the plurality of circuit blocks in the memory bank is cut off for the memory bank, and
- the power-off controller comprises a storage that holds access information for a memory bank in which the voltage supply is cut off.
5 more elements
Dependencies are inferred from the claim text.