Convertible MRAM Section for Flexible Memory Partitioning
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Solution Overview
Problem
Existing on-chip memory structures in embedded systems and battery-powered devices have a fixed split between SRAM and ROM, making it difficult to flexibly extend or replace these memories without re-spinning the semiconductor chip.
Innovation Solution
A magnetic random access memory (MRAM) with a convertible first section that can be reversibly or irreversibly converted into a read-only memory, allowing for dynamic partitioning between read/write and read-only memory sections, utilizing conversion circuitry such as fuses or storage media to control memory access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed split between SRAM and ROM is implemented in on-chip memory structures, then manufacturing simplicity is improved, but adaptability deteriorates because certain areas are pre-defined and cannot be changed later without re-spin of the semiconductor chip
Solution Approach 1:
The patent implements a dynamic memory system where the split between SRAM and ROM areas is not fixed but can be reconfigured after manufacturing. The memory structure allows dynamic redefinition of memory types through control signals and conversion circuitry, enabling the same physical memory cells to be assigned as SRAM or ROM based on system requirements without requiring chip re-spinning.
2Ease of operation
If SRAM structures are used for working memory that needs to be changed or updated, then ease of operation is improved, but security deteriorates because such memories lack the protection features of ROM
Solution Approach 1:
The patent creates a universal memory structure that can function as either SRAM or ROM depending on configuration needs. The same memory cells can be dynamically assigned to different memory types, allowing a single memory area to provide both the update capability of SRAM and the security features of ROM when needed, eliminating the need for separate dedicated SRAM and ROM structures.
3Reliability
If ROM structures are used for storing data or code that must not be changeable, then security is improved, but adaptability deteriorates because these structures cannot be modified or updated
Solution Approach 1:
The patent implements dynamic reconfigurability where memory areas originally designed for security (ROM-like) can be converted to writable memory (SRAM-like) when updates are needed, and vice versa. This dynamic conversion capability allows the system to maintain security when required while also enabling updates when necessary, without being locked into a fixed configuration.
Data Source
AI summary
A magnetic random access memory is configured as a read/write memory and at least a first section of the magnetic random access memory is configured to be converted to a read only memory.