Memory Controller Priority Command Execution
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Solution Overview
Problem
Existing memory devices lack an efficient mechanism to manage and prioritize the execution of commands from multiple hosts, leading to potential performance imbalances and inefficiencies in command processing.
Innovation Solution
A memory system with a controller that stores commands in a queue and determines their execution order based on when the commands were added and whether they are from a designated priority host, using a combination of FIFO management and priority host identification to ensure timely execution of commands from connected hosts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If commands are executed in FIFO order without priority handling, then processing fairness is maintained, but response time for priority hosts increases
Solution Approach 1:
The patent implements dynamic command execution ordering by introducing priority levels that allow the system to adapt its processing sequence based on host importance. Priority hosts can have their commands executed ahead of standard hosts, creating a dynamic rather than static execution order that responds to different operational scenarios.
Solution Approach 2:
The patent applies different execution treatment to different hosts by identifying priority hosts and giving their commands preferential processing. This local quality differentiation allows certain hosts to receive faster service while others follow standard FIFO ordering, optimizing for specific critical operations without completely disrupting overall fairness.
2Speed
If priority host commands are always executed first, then response time for priority hosts is improved, but fairness to other hosts deteriorates
Solution Approach 1:
The patent applies priority handling partially rather than universally. Only commands from identified priority hosts receive expedited processing, while commands from standard hosts continue to be processed in FIFO order. This partial application of priority rules maintains fairness for the majority of hosts while providing enhanced service where needed.
3Ease of operation
If connection duration is unlimited, then host convenience is improved, but performance bottlenecks increase
Solution Approach 1:
The patent implements periodic evaluation of connection status and command queues. The controller periodically assesses which hosts are connected and which commands are waiting, using this periodic information to make execution decisions. This periodic action prevents indefinite connection states from causing performance degradation while maintaining operational convenience.
Data Source
AI summary
A memory device includes a memory unit, a communication interface through which commands are received from a plurality of hosts, and a controller configured to store the commands in a queue and determine an order of execution of the commands according to when the commands were added to the queue and whether or not the commands issued from a host that is designated as a priority host. The controller determines the commands issued from the priority host to be executed prior to other commands that were not issued from the priority host, and determines the other commands to be executed in the order they were added to the queue.