NVDIMM-NLC Memory Module Data Retention via External USB Backup
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Solution Overview
Problem
Current non-volatile dual inline memory modules (NVDIMM-N) are costly and complex due to the need for additional circuitry and components to transfer data between volatile and non-volatile memory during power failures, which is not necessary in datacenter environments with short power outage times.
Innovation Solution
The NVDIMM-NLC memory module uses a volatile memory device with a backup energy source and a controller that emulates non-volatile memory operations by maintaining data in self-refresh mode during power failures, eliminating the need for data transfer to non-volatile memory and reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NVDIMM-N is used to provide non-volatile memory with data transfer capability, then data retention during power failure is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the non-volatile memory transfer functionality from the system by using an external USB-connected non-volatile memory device instead of integrating it into the memory module. This removes the complex data transfer circuitry from the DIMM while preserving data retention capability through the external device.
Solution Approach 2:
The patent introduces an intermediary USB connection and external non-volatile memory device as a mediator between the volatile memory and persistent storage. This intermediary handles the data transfer function externally, allowing the memory module itself to remain simple while achieving non-volatile functionality.
2Reliability
If NVDIMM-N is used to provide non-volatile memory operations, then data preservation during power failure is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a standard USB flash drive or similar inexpensive non-volatile memory device as an external backup solution. This disposable or easily replaceable external device provides the necessary data preservation functionality at minimal cost compared to integrated NVDIMM-N solutions.
Solution Approach 2:
The patent uses a universal USB interface that works with standard consumer electronics, allowing the same external non-volatile memory device to serve multiple purposes across different systems. This multi-functionality reduces manufacturing costs by leveraging existing, mass-produced components rather than custom-built integrated solutions.
3Reliability
If data transfer circuitry is added to enable non-volatile operations, then data retention capability is improved, but the memory module complexity increases
Solution Approach 1:
The patent extracts the data transfer circuitry function from the memory module by using the USB interface and external non-volatile memory device. This removes the complexity of implementing data transfer logic, buffers, and control circuitry within the DIMM itself while maintaining the essential data retention capability through external means.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a lower-cost, simpler memory module that retains data for short durations sufficient for datacenter environments, ensuring data preservation during power failures without the need for complex data transfer mechanisms, thus reducing costs and operational complexity.
Implementation Method 1
a backup energy source coupled to the substrate
Data Source
AI summary
An apparatus and method for memory backup are disclosed as being operational at a memory module that includes a volatile memory device but which is devoid of a non-volatile memory device. The memory module can emulate operations of a non-volatile memory on the memory module while the memory module is devoid of such non-volatile memory.