Shaped and optimized power cycles
Systems and methods, according to the present disclosure, determines a duration of the current queue of commands in the controller, executes all full commands capable of being executed prior to the beginning of a low power cycle. Commands that are not executed may be re-fetched when the device enters a power mode. In an alternate embodiment, a portion of a command that is executable prior to the beginning of a low power cycle is executed, with the un-executed portion of the command being stored on the device, in an “always on” or AON memory. This un-executed portion is fetched and executed when the device enters the power mode.
1. A data storage device, comprising:
one or more memory devices; and
a controller coupled to the one or more memory devices, wherein the controller is configured to:
receive a plurality of commands at the data storage device comprising a power down time, from a host;
calculate an expected execution duration of each one of the plurality of commands;
select a command from the plurality of commands having a duration that will not exceed the power down time;
execute the command; and
cause to enter, by the data storage device, a power down state at the power down time.
2. The data storage device of claim 1 , wherein the command is a member of a subset of the plurality of commands, for which aggregate expected durations of each command of the subset will not exceed the power down time.
3. The data storage device of claim 1 , wherein the controller is further configured to update the power down time of the device after executing the command based on the duration of the execution of the command.
4. The data storage device of claim 3 , wherein the controller is further configured to select a second command from the plurality of commands having a duration that will not exceed the updated power down time.
5. The data storage device of claim 4 , wherein the controller is further configured to update the power down time of the device based on the duration of the execution of the second command.
6. The data storage device of claim 3 , wherein the controller is further configured to select a second command from the plurality of commands having a duration that will exceed the updated power down time.
7. The data storage device of claim 6 , wherein the controller is further configured to execute a portion of the second command.
8. The data storage device of claim 7 , wherein the controller is further configured to store an un-executed portion of the second command.
9. The data storage device of claim 8 , wherein the controller is further configured to power up the data storage device at a power up time, and further configured to fetching the un-executed portion of the second command at the power up time and executing the un-executed portion of the second command.
10. The data storage device of claim 9 , wherein the controller is further configured to fetch a third command from the host during execution of the un-executed portion of the second command.
11. A data storage device, comprising:
one or more memory devices; and
a controller coupled to the one or more memory devices, the controller configured to:
receive a plurality of commands at a device comprising a power down time and a power up time, from a host;
calculate an expected execution duration of each one of the plurality of commands;
select a command from the plurality of commands having a duration that will exceed the power down time of the device;
execute a portion of the command that can be executed prior to the power down time; and
enter, by the device, a power down state at the power down time.
12. The data storage device of claim 11 , wherein the controller is further configured to store an un-executed portion of the command prior to the power down time.
13. The data storage device of claim 12 , wherein the controller is further configured to:
enter, by the device, a power up state at the power up time;
fetch the un-executed portion of the command; and
execute the un-executed portion of the command.
14. The data storage device of claim 13 , wherein the controller is further configured to fetch an additional command from the host during one of the fetching of the un-executed portion of the command, and execution of the un-executed portion of the command.