Dynamic Chip Select Signal Management for Memory Initialization
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Solution Overview
Problem
Conventional single-rank memory modules cannot utilize address mirroring due to the lack of separate chip select signals, hindering initialization procedures such as loading mode registers, whereas dual-rank modules can exploit mirrored configurations with multiple chip select signals.
Innovation Solution
Providing at least two separate chip select signals to mirrored memory devices during specific modes of operation, such as loading mode registers, and transitioning to a single chip select signal during normal operation to simultaneously select both memory devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single chip select signal is used to select memory devices, then device complexity is reduced, but initialization procedures cannot be performed on mirrored memory devices
Solution Approach 1:
The system dynamically switches between single chip select signal mode during normal operation and multiple separate chip select signals mode during initialization procedures. This allows the same memory module to adapt its chip select signal structure based on operational requirements, enabling both simplified normal operation and capable initialization procedures.
Solution Approach 2:
During initialization procedures, the single chip select signal is segmented into multiple separate chip select signals, allowing independent selection of individual memory devices in mirrored configurations. This segmentation enables precise control during initialization while maintaining simplicity during normal operation.
2Adaptability or versatility
If separate chip select signals are provided to mirrored memory devices, then initialization procedures can be performed, but device complexity increases
Solution Approach 1:
The system dynamically switches between multiple separate chip select signals mode during initialization and single chip select signal mode during normal operation. This dynamic adaptation allows the system to have complex signal structures only when necessary for initialization, while maintaining simplicity during normal operation.
3Reliability
If address mirroring is implemented, then signal integrity is improved, but single-rank memory modules cannot utilize this configuration
Solution Approach 1:
The system segments the chip select signal into multiple separate signals during initialization procedures, enabling single-rank memory modules to independently address and initialize mirrored memory devices. This segmentation allows the module to exploit address mirroring configurations that were previously unavailable to single-rank modules.
Solution Approach 2:
The system dynamically adapts its chip select signal structure to enable single-rank memory modules to utilize mirrored configurations. By providing separate chip select signals during initialization, the system allows these modules to take advantage of the signal integrity benefits of address mirroring while maintaining their single-rank architecture.
Data Source
AI summary
Apparatus and methods are disclosed herein, including those that operate to initialize registers of a first memory device and a second memory device of a single-rank memory module by providing separate chip select signals to separately select a first memory device and a second memory device. A method may further include, subsequent to sensing that the initializing is completed, for example, providing a single chip select signal to simultaneously select the first memory device and the second memory device.