SSD Two-Phase Initialization with Sideband-to-PCIe Boot Transfer
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Solution Overview
Problem
Certain types of memory devices, such as solid state drives (SSDs), have boot-up times that cannot be reduced sufficiently, making them unsuitable for applications requiring fast boot-up times, such as embedded and automotive systems.
Innovation Solution
Implementing a two-phase initialization process for SSDs, where a first initialization process for a smaller set of memory resources enables a sideband interface for initial data transfer, followed by a second initialization for a larger set of resources that establishes a PCIe interface for faster data transfer once completed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a traditional single-phase initialization process is used for SSDs, then the complete memory resources are initialized, but the boot-up time cannot be reduced sufficiently
Solution Approach 1:
The initialization process is divided into two distinct phases: a first initialization process for a first set of memory resources and a second initialization process for a second set of memory resources. This segmentation allows the boot-up process to proceed with critical resources first, reducing boot-up time while completing full initialization in the background.
Solution Approach 2:
The first initialization process performs preliminary actions on critical memory resources before the second initialization process completes. By initializing essential resources first and enabling the PCIe interface early, the system can begin data transfer operations sooner, effectively reducing the perceived boot-up time.
2Speed
If PCIe interface is established early for fast data transfer, then data transfer speed is improved, but the initialization process cannot complete fully
Solution Approach 1:
The PCIe interface is enabled during the first initialization process before the second initialization completes. This preliminary enabling allows fast data transfer to begin early, while the second initialization continues in the background to complete the full initialization of all memory resources, ensuring both speed and completeness.
Solution Approach 2:
The initialization process maintains continuity by overlapping the first and second initialization processes. The PCIe interface remains enabled and continues to provide fast data transfer while the second initialization process continues to complete in the background, ensuring both fast transfer and full initialization completion.
Data Source
AI summary
Implementations described herein relate to memory device initialization. In some implementations, a memory device may perform a first initialization for a first set of memory resources, the first initialization being associated with a boot image initialization. The memory device may enable a sideband interface, for data transfer between the memory device and a host device, based on a completion of the first initialization. The memory device may perform a second initialization for a second set of memory resources that is larger than the first set of memory resources. The memory device may enable a peripheral component interconnect express interface, for data transfer between the memory device and the host device, based on a completion of the second initialization.