Descriptor scheduler

A method comprising:

• receiving a first command to access a memory, the first command indicating at least one of a first segment that serves data associated with the first command, or a first instruction for retrieving data from or writing data to a first flash memory device through a first channel;
• receiving a second command, the second command indicating at least one of a second segment that serves data associated with the second command, or a second instruction for retrieving data from or writing data to a second flash memory device through a second channel;
• determining a segment status of the first segment and the second segment, or a channel status of the first channel and the second channel;
• and
• scheduling a processing of the first command and the second command based on the segment status or the channel status such that an order of the scheduled processing for the first and second commands includes processing a later-issued command before an earlier-issued command.

A system comprising:

• a host that issues a plurality of job descriptors each specifying at least one of a target segment or target channel;
• a buffer manager that controls a plurality of segments including the target segment, each segment associated with a different job descriptor for temporarily storing data associated with the different job descriptor, the data including data to be written to a flash memory device or data read from the flash memory device;
• a plurality of flash memory devices each operatively coupled to a different channel for communicating each data associated with a different job descriptor between the host and the respective flash memory device;
• and
• a sequencer that schedules an execution of a job descriptor with respect to other job descriptors based on an availability of the target segment or the target channel such that an order of the scheduled execution includes executing a later-issued job descriptor before an earlier-issued job descriptor.