Memory Synchronization via Latency-Adjusted Command Timing
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Solution Overview
Problem
Conventional memory systems with multiple devices on a shared memory bus struggle to synchronize operations when devices have different latencies, as a single command cannot effectively coordinate data transfer and termination modes across devices with varying response times.
Innovation Solution
A memory system where a host device sends separate commands to each memory device at times delayed by the latency difference between them, ensuring that operations are synchronized by accounting for individual latency responses, allowing for coordinated data transfer and termination modes across devices with different latencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single command is used to synchronize memory operations across multiple devices, then operational simplicity is improved, but synchronization accuracy deteriorates when devices have different latencies
Solution Approach 1:
The patent divides the synchronization mechanism into device-specific segments. Instead of using a single universal command for all devices, the system issues separate commands to each memory device tailored to its specific latency characteristics. This segmentation allows each device to be controlled independently according to its performance characteristics, resolving the contradiction between operational simplicity and synchronization accuracy.
Solution Approach 2:
The patent applies local quality by customizing the command timing and parameters for each individual memory device based on its specific latency. Rather than applying a uniform control approach across all devices, the system adjusts the command issuance timing locally for each device to account for its unique response characteristics, thereby achieving precise synchronization despite device variations.
2Adaptability or versatility
If memory devices with different latencies are used to increase system adaptability, then versatility is improved, but operational coordination becomes more complex
Solution Approach 1:
The patent implements dynamics by making the command issuance timing adaptive rather than static. The host device dynamically adjusts the timing of commands based on the specific latency characteristics of each memory device. This dynamic approach allows the system to accommodate various device latency profiles while maintaining coordinated operation, effectively managing the complexity through adaptive timing mechanisms.
Solution Approach 2:
The patent applies parameter changes by modifying the timing parameters of memory commands based on device-specific latency measurements. The host device adjusts critical timing parameters such as command issuance intervals and timing offsets to account for different device latencies. This parameter adjustment mechanism enables the system to work with diverse memory devices while maintaining proper synchronization.
3Measurement precision
If separate commands are sent to each memory device at different times, then synchronization accuracy is improved, but command issuance complexity increases
Solution Approach 1:
The patent applies preliminary action by having the host device measure and determine the latency of each memory device before issuing actual memory commands. This preliminary latency characterization allows the system to pre-calculate the appropriate timing offsets for each device. By performing this measurement and setup work in advance, the system simplifies the actual command issuance process while maintaining high synchronization accuracy.
Data Source
AI summary
A memory system is provided. The memory system includes a first memory device having a first latency corresponding to a first command and a second memory device having a second latency corresponding to a second command. The second latency differs from the first latency by a latency difference. The memory system further includes a host operably coupled to the first and second memory devices. The host is configured to send the first command to the first memory device at a first time, and to send the second command to the second memory device at a second time. The first time and the second time are separated by a delay corresponding to the latency difference.