Holdup time measurement for solid state drives
First Claim
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1. A solid state drive (SSD) comprising:
- a primary controller operable at a first minimum operable voltage;
a secondary controller operable at a second minimum operable voltage that is less than the first minimum operable voltage; and
a power circuit configured to supply power to the primary controller and the secondary controller from a power source during normal operation of the SSD and from a backup power source in response to a loss of power supplied by the power source, whereinthe secondary controller is configured to track a time from the loss of power supplied by the power source to a reset of the primary controller,wherein the primary controller is not operable at a supply voltage below the first minimum operable voltage, and the secondary controller is operable at the supply voltage below the first minimum operable voltage.
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Abstract
In one embodiment, a solid state drive (SSD) with power loss protection (PLP) includes a SSD controller, a secondary controller and a power circuit configured to supply power to the SSD from a power source during normal operation and backup power from a backup power source in response to a loss of power supplied by the power source. In the event of a loss of power, the secondary controller is configured to track the holdup time, or duration of time for which the primary controller can operate on backup power. In one embodiment, the holdup time tracked by the secondary controller is stored in a non-volatile memory in communication with the secondary controller.
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Citations
20 Claims
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1. A solid state drive (SSD) comprising:
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a primary controller operable at a first minimum operable voltage; a secondary controller operable at a second minimum operable voltage that is less than the first minimum operable voltage; and a power circuit configured to supply power to the primary controller and the secondary controller from a power source during normal operation of the SSD and from a backup power source in response to a loss of power supplied by the power source, wherein the secondary controller is configured to track a time from the loss of power supplied by the power source to a reset of the primary controller, wherein the primary controller is not operable at a supply voltage below the first minimum operable voltage, and the secondary controller is operable at the supply voltage below the first minimum operable voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of power loss protection (PLP) for a solid state drive (SSD), the method comprising:
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supplying power from a power source during normal operation of the SSD and from a backup power source in response to a loss of power supplied by the power source; supplying power to a primary controller operable at a first minimum operable voltage, a secondary controller and a non-volatile memory operable at a second minimum operable voltage that is less than the first minimum operable voltage, the non-volatile memory being in communication with the secondary controller; and tracking a time from the loss of power to a reset of the primary controller, wherein the primary controller is not operable at a supply voltage below the first minimum operable voltage, and the secondary controller is operable at the supply voltage below the first minimum operable voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification