Data storage device and method for power saving in a variable host throughput environment

Patent metadata

Field	Value
Publication number	US-12572285-B2
Application number	US-202418596212-A
Country	US
Kind code	B2
Filing date	Mar 5, 2024
Priority date	Mar 5, 2024
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

A data storage device and method for power saving in a variable host throughput environment are provided. In one embodiment, a data storage device is provided comprising a memory and one or more processors. The one or more processors, individually or in combination, are configured to: detect that a data consumption rate of a host is below a threshold; and in response to detecting that the data consumption rate of the host is below the threshold, enter a power-saving mode by: storing, in the non-volatile memory, a context of a pending host command in a command queue; and reducing power to at least one component of the data storage device. Other embodiments are disclosed.

First claim

What is claimed is:

1 . A data storage device comprising:
a non-volatile memory; and one or more processors, individually or in combination, configured to:
detect that a data consumption rate of a host is below a threshold;
in response to detecting that the data consumption rate of the host is below the threshold, send, to the host, a request that the host not send an additional host command for an amount of time that the data storage device will be in and exit from a power-saving mode; and
in response to receiving, from the host, acceptance of the request, enter the power-saving mode by:
storing, in the non-volatile memory, a context of a pending host command in a command queue; and
reducing power to at least one component of the data storage device.

2 . The data storage device of claim 1 , wherein the one or more processors, individually or in combination, are further configured to exit the power-saving mode by:
reading, from the non-volatile memory, the context of the pending host command; and restoring power to the at least one component of the data storage device.

3 . The data storage device of claim 2 , wherein the one or more processors, individually or in combination, are further configured to exit the power-saving mode in response to an expiration of a time period.

4 . The data storage device of claim 3 , wherein the time period is a function of the data consumption rate of the host and a size of a buffer in the host.

5 . The data storage device of claim 2 , wherein the one or more processors, individually or in combination, are further configured to exit the power-saving mode in response to receiving a new host command from the host.

6 . The data storage device of claim 2 , wherein the one or more processors, individually or in combination, are further configured to exit the power-saving mode in response to receiving a command from the host to exit the power-saving mode.

7 . The data storage device of claim 1 , wherein the one or more processors, individually or in combination, are further configured to seek approval from the host of an increase in latency in exiting the power-saving mode.

8 . The data storage device of claim 1 , wherein the one or more processors, individually or in combination, are further configured to perform a handshake with the host to enable use of the power-saving mode.

9 . The data storage device of claim 1 , wherein the non-volatile memory comprises a three-dimensional memory.

10 . A method comprising:
performing in a data storage device:
determining that at least one outstanding host command that has not been completed;
sending, to a host, a request that the host not send an additional host command for an amount of time that the data storage device will be in and exit from a low-power mode; and
in response to receiving, from the host, acceptance of the request, entering the low-power mode even though the at least one outstanding host command has not been completed.

11 . The method of claim 10 , wherein entering the low-power mode comprises:
storing a state of the at least one outstanding host command; and reducing power to at least one component of the data storage device.

12 . The method of claim 10 , further comprising exiting the low-power mode.

13 . The method of claim 12 , wherein exiting the low-power mode comprises:
restoring the state of the at least one outstanding host command; and restoring power to the at least one component of the data storage device.

14 . The method of claim 12 , wherein the low-power mode is exited in response to an expiration of a time period.

15 . The method of claim 14 , wherein the time period is a function of a data consumption rate of the host and a size of a buffer in the host.

16 . The method of claim 12 , wherein the low-power mode is exited in response to receiving a new host command from the host.

17 . The method of claim 12 , wherein the low-power mode is exited in response to receiving a command from the host to exit the low-power mode.

18 . The method of claim 10 , wherein the host comprises an autonomous vehicle.

19 . The method of claim 10 , wherein the host comprises an autonomous vehicle.

20 . A data storage device comprising:
a memory; and means for:
detecting that at least one pending host command has not been completed;
sending, to a host, a request that the host not send an additional host command for an amount of time that the data storage device will be in and exit from a standby mode; and
in response to receiving, from the host, acceptance of the request, entering the standby mode even though the at least one pending host command has not been completed.

Assignees

• Western Digital Tech Inc

Inventors

• Sharma Amit
• Agarwal Dinesh Kumar
• Venugopal Abhinandan

Classifications

• G06F3/0653 Primary

  Monitoring storage devices or systems · CPC title

• G06F3/0634

  by changing the state or mode of one or more devices · CPC title

• G06F3/0679

  Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP] · CPC title

• G06F3/0659

  Command handling arrangements, e.g. command buffers, queues, command scheduling · CPC title

• G06F3/0625 Primary

  Power saving in storage systems · CPC title