Memory System Boot Sequencing for Lower Initialization Latency
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Solution Overview
Problem
Memory systems incur latency during boot-up sequences due to negotiation of data rates, which can delay the initialization of time-sensitive applications.
Innovation Solution
A host system asserts a fast boot signal to initiate communication at a lower data rate before negotiating to a higher rate, allowing time-sensitive applications to initialize quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the memory system negotiates to the highest supported data rate during boot-up, then data transfer speed is improved, but boot-up latency increases
Solution Approach 1:
The memory system performs preliminary actions by initializing boot-up applications at a lower data rate before negotiating to the highest supported data rate. This allows time-sensitive applications to start quickly without waiting for the full negotiation sequence to complete, effectively performing the critical initialization function in advance of optimal conditions.
Solution Approach 2:
The system dynamically adjusts the data rate during the boot-up sequence rather than maintaining a fixed rate throughout. It transitions from an initial lower data rate to the highest supported data rate as applications are initialized, allowing the system to adapt its performance characteristics to the immediate needs of different applications during the boot process.
2Loss of time
If the memory system uses a lower data rate during initial communication, then boot-up latency is reduced, but overall data transfer performance decreases
Solution Approach 1:
The system uses the lower data rate as a preliminary measure only for initializing boot-up applications, not for sustained operation. After applications are loaded, the system negotiates to the highest supported data rate to ensure optimal performance for subsequent data transfer operations, thus limiting the impact on overall productivity.
Solution Approach 2:
The data rate is dynamically changed from an initial lower rate to the highest supported rate after application initialization. This dynamic adjustment ensures that the system achieves low latency during the critical boot phase while maintaining high productivity during normal operation, resolving the contradiction between speed and performance.
Data Source
AI summary
Methods, systems, and devices for memory system boot sequence with reduced latency are described. A host system may assert a signal (e.g., a fast boot signal) to a pin of a memory system, which may instruct the memory system to communicate data at a first data rate (e.g., a relatively lower data rate) before negotiating to a higher data rate (e.g., a highest data rate). The host system may output the fast boot signal to the memory system based on an estimated size of the data to be transferred, a dynamic measurement of the data, an application associated with the data, or any combination thereof. Based on transferring the data, the host system and the memory system may negotiate to an increased data rate (e.g., up to the highest supported data rate).