Dynamic Command Timing Pattern for Memory Latency
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Solution Overview
Problem
Current memory systems face inefficiencies in latency and operation due to rigid timing constraints in command sequences, particularly in activating and accessing memory cells across different bank groups, which can lead to unnecessary commands and reduced performance.
Innovation Solution
Implementing a dynamic configuration of deselect commands between activation and data access commands to satisfy timing constraints, allowing for truncation of command sequences and improved latency without violating industry-standard timing specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid timing constraints are enforced in command sequences, then timing specification compliance is ensured, but latency and operation efficiency deteriorate
Solution Approach 1:
The patent applies dynamics by making the deselect command sequence configurable and adaptable rather than fixed. The system dynamically adjusts the number of deselect commands based on timing requirements, allowing the command sequence to flex between minimum and maximum values to optimize latency while ensuring timing compliance.
Solution Approach 2:
The patent changes the parameter of deselect command quantity from a fixed value to a configurable range. By allowing the host device to configure the number of deselect commands within specified minimum and maximum bounds, the system can adjust timing parameters to reduce latency while maintaining specification compliance.
2Reliability
If additional deselect commands are inserted between activation and data access commands, then timing constraints are satisfied, but command sequence length and operation overhead increase
Solution Approach 1:
The patent applies partial action by implementing only the necessary number of deselect commands required to satisfy timing constraints, rather than always using a fixed maximum number. The system configures the deselect command sequence to provide just enough timing margin without adding excessive overhead, optimizing the balance between constraint satisfaction and operational efficiency.
3Speed
If command sequences are truncated to reduce latency, then speed is improved, but timing constraint compliance may be violated
Solution Approach 1:
The patent implements feedback mechanisms where the memory device monitors timing parameters and provides status information about timing constraint satisfaction. This allows the host device to adjust the deselect command configuration based on actual timing conditions, ensuring compliance while optimizing for speed through informed decision-making rather than conservative fixed timing.
Data Source
AI summary
Methods, systems, and devices for modification of a command timing pattern are described. A host device may transmit (e.g., issue), to a memory device, a quantity of deselect commands between activation or data access commands to satisfy configured timing constraints. Each deselect command may indicate a polarity (e.g., a high voltage or a low voltage) for a command and address (CA) pin at the memory device. In some examples, the quantity of deselect commands may include one or more sequences of deselect commands (e.g., low-high-high-high). The host device may truncate a sequence of deselect commands, for example to satisfy timing constraints without transmitting additional unnecessary commands. By dynamically configuring the quantity of deselect commands, the host device may improve latency and overall efficiency of system operations without violating the configured timing constraints.