Hybrid Memory Module Super-Stack Controller Architecture
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Solution Overview
Problem
Current memory systems struggle to integrate different memory technologies, such as DRAM, flash memory, and SRAM, into a single module while maintaining a standard interface, as each technology has distinct properties like latency and bandwidth that are not compatible with traditional DRAM systems.
Innovation Solution
A hybrid memory module architecture that combines multiple memory technologies, using fast memory as a latency-hiding buffer to mask the slower memory devices, presenting a unified standard interface to the host computer, which includes a Super-Stack structure with a Super-Controller and Sub-Controllers to manage and translate signals between different memory types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If different memory technologies (DRAM, flash, SRAM) are integrated into a single module, then memory capacity and cost-effectiveness are improved, but latency compatibility and interface standardization deteriorate
Solution Approach 1:
A controller is introduced as an intermediary component between the host system and the hybrid memory module. This controller translates host memory requests into appropriate commands for different memory technologies (DRAM, flash, SRAM), managing the interface compatibility layer and allowing diverse memory types to work together through a unified standard interface.
Solution Approach 2:
The hybrid memory module design implements a universal interface that can handle multiple memory technology types through a single standardized connection. The module accepts standard memory requests from the host and internally routes them to appropriate memory banks (volatile or non-volatile), providing multi-functionality without requiring separate interfaces for each memory type.
2Quantity of substance
If slow memory devices are combined with fast memory devices in a hybrid module, then cost and capacity are improved, but latency performance deteriorates
Solution Approach 1:
The system performs preliminary actions by pre-loading frequently accessed data from slow non-volatile memory into fast volatile memory buffers before they are needed. This anticipatory data movement reduces the effective latency when data is subsequently accessed, as the controller can serve requests from the fast buffer rather than waiting for slow memory access.
Solution Approach 2:
While one memory access is in progress, the controller continues to prepare subsequent data transfers by pre-fetching or pre-processing data from other memory banks. This overlapping of operations ensures continuous useful action, minimizing idle time and effectively masking the latency of slow memory devices through parallel data preparation.
3Ease of operation
If a unified interface is presented to the host for hybrid memory, then ease of operation is improved, but controller complexity increases
Solution Approach 1:
The controller is segmented into distinct functional modules, each responsible for specific tasks such as command decoding, address translation, data buffering, and error correction. This modular segmentation allows the complex controller functionality to be organized into manageable units that can operate independently, simplifying the overall design and maintenance while maintaining a unified external interface.
Data Source
AI summary
One embodiment of the present invention sets forth a hybrid memory module that combines memory devices of different types while presenting a single technology interface. The hybrid memory module includes a number of super-stacks and a first interface configured to transmit data between the super-stacks and a memory controller. Each super-stack includes a number of sub-stacks, a super-controller configured to control the sub-stacks, and a second interface configured to transmit data between the sub-stacks and the first interface. Combining memory devices of different types allows utilizing the favorable properties of each type of the memory devices, while hiding their unfavorable properties from the memory controller.