Memory Controller Cache Read Command Management
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Solution Overview
Problem
Existing memory systems face inefficiencies in performing sequential read operations due to the lack of effective management of cache read commands and other operations, leading to increased overhead and potential errors in non-volatile memory devices.
Innovation Solution
A memory system architecture that includes a non-volatile memory device, a host controller, and a memory controller, which generates and manages cache read commands, read preparation commands, and read end commands to optimize sequential read operations by managing command queues and error checking, thereby improving operational efficiency and reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cache read commands are managed without proper insertion of read preparation and read end commands, then the memory system structure is simpler, but the sequential read operation efficiency deteriorates and overhead increases
Solution Approach 1:
The memory controller inserts read preparation commands before cache read commands to prepare the memory device in advance for upcoming read operations. This preliminary action ensures that the memory device is ready to execute sequential read operations without delay, improving read efficiency by pre-configuring the necessary read parameters and addressing sequences.
Solution Approach 2:
The memory controller monitors the execution status of cache read commands and dynamically inserts read end commands based on real-time feedback about command completion and memory device state. This feedback mechanism allows the controller to optimize command sequencing by adjusting the insertion of termination commands according to actual operational needs, thereby improving sequential read throughput.
2Reliability
If read end commands are not properly inserted after cache read commands, then the command queue management is simpler, but errors in read operations increase
Solution Approach 1:
The memory controller uses feedback from command execution status and memory device state to determine when to insert read end commands. This feedback-driven approach ensures that read operations are properly terminated only when appropriate, preventing errors while adapting to varying operational conditions such as consecutive cache read commands or mixed operation sequences.
Solution Approach 2:
The command insertion mechanism is dynamic rather than static, allowing the memory controller to adjust the timing and placement of read end commands based on real-time system state. This dynamic adaptation enables reliable read operations across different scenarios including sequential cache reads, mixed operations, and varying command queue conditions without requiring complex predetermined scheduling.
3Reliability
If the memory controller adds read preparation and read end commands dynamically, then read operation reliability improves, but the command processing time increases
Solution Approach 1:
Read preparation commands are inserted in advance to pre-configure the memory device for upcoming read operations, reducing the actual execution time of sequential reads. By preparing the memory device beforehand with necessary parameters and addressing information, the system minimizes latency during the actual read operations despite the additional command processing overhead.
Solution Approach 2:
The memory controller maintains continuous command flow by strategically inserting preparation and termination commands that keep the memory device actively engaged in useful operations. This continuity approach ensures that the added commands do not create idle periods or interruptions, maintaining high utilization of the memory device while ensuring reliable read operation execution.
Data Source
AI summary
A memory system includes: a non-volatile memory device; a host controller suitable for generating a cache read command for controlling a cache read operation of the non-volatile memory device and at least one other command for controlling at least one other operation of the non-volatile memory device excluding the cache read operation in response to a request received from a host; and a memory controller suitable for controlling an operation of the non-volatile memory device in response to the cache read command and the at least one other command that are inputted from the host controller. The memory controller suitable for checking out the operation of the non-volatile memory device corresponding to a command that is inputted next to the input of the cache read command, and adding a read operation command including a read preparation command or a read end command next to the cache read command.