Command scheduling component for memory

A method, comprising:

• making a first determination of whether at least one memory bank of a plurality of memory banks is active, wherein an activate command for a row of the at least one memory bank accessed by an oldest command for the at least one memory bank is added to a command scheduler in response to determining the at least one memory bank is not active;
• in response to the activate command being added to the command scheduler, making a second determination of whether the at least one memory bank is active;
• wherein the second determination is made immediately after the activate command is added to the command scheduler with no scheduling actions occurring between the activate command being added to the command scheduler and the second determination being made;
• in response to the second determination of whether the at least one memory bank is active coming to a determination that the at least one memory bank is active, determining whether the row of the at least one memory bank has a corresponding row command, wherein an oldest row command corresponding to the row of the at least one memory bank is added to the command scheduler in response to determining the at least one memory bank is active and determining there is a row command corresponding to the row of the at least one memory bank;
• in response to the oldest row command corresponding to the row of the at least one memory bank being added to the command scheduler, making a third determination of whether the at least one memory bank is active, wherein:
• the third determination is made immediately after the oldest row command corresponding to the row of the at least one memory bank is added to the command scheduler with no scheduling actions occurring between the oldest row command corresponding to the row of the at least one memory bank being added to the command scheduler and the third determination being made;
• and
• a precharge command for the at least one memory bank is added to the command scheduler in response to determining the at least one memory bank is active, determining the at least one memory bank does not have a row command corresponding to the row of the at least one memory bank, and determining either a close page mode is enabled or an open row timer has expired on the row of the at least one memory bank;
• and
• executing a command in the command scheduler based on a priority of commands included in the command scheduler in response to determining the at least one memory bank is active, the row of the at least one memory bank does not have a corresponding row command, either the close page mode is enabled or the open row timer has expired, and the command is executable.

A non-transitory computer-readable storage medium comprising instructions that, when executed by a processing device, cause the processing device to:

• make a first determination of whether at least one memory bank of a plurality of memory banks is active;
• in response to the first determination determining that the at least one memory of the plurality of memory banks is not active, determine whether the at least one memory bank has a corresponding read command, wherein:
• a first activate command for a row of the at least one memory bank that is accessed by an oldest write command is added to a command scheduler in response to determining that the at least one memory bank does not have the corresponding read command, as well as determining the at least one memory bank is not active;
• and
• a second activate command for the row of the at least one memory bank that is accessed by an oldest read command is added to the command scheduler in response to determining that the at least one memory bank has the corresponding read command, as well as determining the at least one memory bank is not active;
• in response to either the first activate command or the second activate command being added to the command scheduler, make a second determination of whether the at least one memory bank is active, wherein the second determination is made immediately after either the first activate command or the second activate command is added to the command scheduler with no scheduling actions occurring between either the first activate command or the second activate command being added to the command scheduler and the second determination being made;
• in response to the second determination of whether the at least one memory bank is active making a determination that the at least one memory bank is active, determine whether a row of the at least one memory bank has a corresponding row command, wherein the corresponding row command is the first activate command, the second activate command, or a precharge command;
• in response to determining the at least one active memory bank has the corresponding row command, determine whether the at least one active memory bank has a corresponding read command, wherein:
• the oldest row command for the row of the at least one active memory bank is added to the command scheduler in response to determining the at least one active memory bank does not have the corresponding read command;
• and
• a determination is made whether the oldest read command for the row of the at least one active memory bank corresponds to an active row of the at least one active memory bank in response to determining the at least one active memory bank has the corresponding read command, wherein:
• the oldest row command for the row of the at least one active memory bank is added to the command scheduler in response to determining the oldest read command corresponds to the active row of the at least one active memory bank;
• and
• a first precharge command is added to the command scheduler in response to determining the oldest read command does not correspond to the active row of the at least one active memory bank;
• in response to either the oldest row command for the row of the at least one active memory bank being added to the command scheduler or the first precharge command being added to the command scheduler, make a third determination of whether the memory bank is active, wherein the third determination is made immediately after either the oldest row command for the row of the at least one active memory bank or the first precharge command is added to the command scheduler with no scheduling actions occurring between the oldest row command for the at least one memory bank or the first precharge command being added to the command scheduler and the third determination being made;
• in response to the third determination of whether the at least one memory bank is active coming to the determination that the at least one memory bank is active and the row of the at least one active memory bank does not have a row command, determine whether either a close page mode is enabled on the row of the at least one active memory bank or an open row timer has expired on the row of the at least one active memory bank, wherein a second precharge command is added to the command scheduler in response to determining either the close page mode is enabled on the row of the at least one active memory bank or the open row timer has expired on the row of the at least one active memory bank;
• in response to the second precharge command being added to the command scheduler, determine whether any commands in the command scheduler can be executed;
• and
• in response to determining the command scheduler includes at least one executable row command, execute the row command based on a priority of commands.