Memory Controller Loopback Interception for Pre-Integration Validation
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Solution Overview
Problem
Conventional methods for extending the functionality of memory controllers in processor-based devices require direct modification of the memory controller, which is often impossible or infeasible due to technical limitations or intellectual property restrictions, and there is a need for a mechanism to provide additional functionality without altering the memory controller.
Innovation Solution
A memory access intercept circuit is used to extend the functionality of memory controllers by operating in a loopback mode, intercepting and transforming data without modifying the memory controller, enabling data encryption, decryption, and error correction without direct intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If direct modification of the memory controller is performed to extend functionality, then the functionality can be extended, but it becomes impossible or infeasible due to technical limitations or intellectual property restrictions
Solution Approach 1:
The patent introduces a memory access intercept circuit as an intermediary component that sits between the memory controller and the memory device. This intercept circuit captures memory access requests, performs transformations (such as encryption or error correction), and forwards modified requests to the memory controller. This mediator approach allows functionality extension without directly modifying the memory controller, resolving the contradiction between adaptability and ease of manufacture.
Solution Approach 2:
The patent segments the memory access function into separate components: the memory controller handles basic memory operations, while the intercept circuit handles specialized transformations. By dividing the memory access pathway into distinct functional segments, the system enables functionality extension through the intercept circuit without requiring modifications to the memory controller itself.
2Adaptability or versatility
If additional functionality is added to the memory controller, then more capabilities are provided, but the complexity of the memory controller increases
Solution Approach 1:
The intercept circuit serves as a mediator that handles additional functionality outside the memory controller. By placing transformation logic in this separate intercept circuit rather than within the memory controller, the patent extends functionality while keeping the memory controller's complexity manageable and unchanged.
Solution Approach 2:
The intercept circuit is designed as a universal component that can perform multiple transformations (encryption, decryption, error correction, encoding) without requiring separate dedicated circuits for each function. This multi-functional design allows functionality extension while minimizing overall system complexity.
3Reliability
If functional validation is performed before integration, then quality is improved, but time and resources are consumed
Solution Approach 1:
The intercept circuit enables preliminary action by allowing functional validation and screening of memory access operations before the final integrated system is deployed. Testing circuits can use the intercept circuit to validate functionality in advance, ensuring quality before full integration while managing testing time through efficient validation mechanisms.
Data Source
AI summary
Apparatus and methods for extending functionality of memory controllers using a loopback mode for testing are disclosed herein. In one aspect, a processor-based device provides a memory access intercept circuit configured to receive a memory write request that is directed to and received by a memory controller. The memory access intercept circuit transmits proxy write data to the memory controller, and intercepts write data directed to the memory controller for the memory write request. The memory access intercept circuit stores the write data in a write data buffer, and, upon intercepting the proxy write data from the memory controller directed to a physical (PHY) interface circuit, retrieves the write data from the write data buffer and transmits the write data to the PHY interface circuit. The memory access intercept circuit subsequently receives, from the PHY interface circuit, loopback data, and stores the loopback data in a read data buffer.