Memory Interrupt Signaling via EDC Channel Inversion
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Solution Overview
Problem
Memory devices in electronic systems face challenges in transmitting interrupt signals to host devices to mitigate or prevent adverse outcomes associated with memory degradation or failure, particularly in high-reliability applications like automotive systems, where timely corrective actions are crucial.
Innovation Solution
The implementation of interrupt signaling mechanisms within memory devices, utilizing dedicated pins or error detection code (EDC) channels to transmit interrupt signals, allowing host devices to alter operations and take corrective actions, such as data transfer or configuration changes, based on detected degradation conditions like error rates, voltage thresholds, or PLL status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If memory devices transmit interrupt signals to host devices, then system reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements interrupt signaling by repurposing existing memory device interfaces (command/address interfaces, data interfaces, or error detection code channels) to carry interrupt signals. This allows the same physical interfaces to serve multiple functions - both their original purposes and interrupt signal transmission - thereby improving reliability without adding dedicated interrupt pins or separate signaling channels that would increase device complexity.
2Reliability
If interrupt signaling is implemented using dedicated pins, then signal transmission reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent eliminates the need for dedicated interrupt pins by utilizing existing multi-functional interfaces. The command/address interface, data interface, or EDC channel can dynamically serve both their traditional functions and interrupt signal transmission, simplifying the manufacturing process by reducing the number of required physical pins and interconnections while maintaining reliable signal transmission through protocol-level multiplexing.
3Device complexity
If interrupt signals are transmitted through existing interfaces, then device complexity is reduced, but signal transmission reliability may worsen
Solution Approach 1:
The patent segments the transmission medium into dedicated time slots or communication channels within the existing interfaces. Interrupt signals are transmitted in specific time windows or through designated channels that are separate from normal data operations, ensuring that interrupt signals maintain their own reliable transmission path without being corrupted by data traffic, even though they share the physical interface.
Solution Approach 2:
The patent implements acknowledgment mechanisms where the host device confirms receipt of interrupt signals. This feedback loop ensures that interrupt signals are reliably transmitted and received, allowing the system to detect and handle any transmission failures, thereby maintaining high reliability despite using shared interfaces.
4Reliability
If real-time interrupt monitoring is implemented, then system reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements interrupt signaling as an event-driven periodic mechanism rather than continuous monitoring. The memory device transmits interrupt signals only when specific degradation conditions are detected (such as error rates exceeding thresholds, voltage deviations, or temperature anomalies), and the host device enters low-power states between interrupts. This approach maintains high reliability by detecting critical conditions while minimizing energy consumption by avoiding continuous active monitoring.
Data Source
AI summary
Methods, systems, and devices for interrupt signaling for a memory device are described. A memory device may transmit an interrupt signal to a host device to alter a sequence of operations that would otherwise be executed by the host device. The memory device may transmit the interrupt signal in response to detecting an error condition at the memory device, a performance degradation at the memory device, or another trigger event. In some examples, the memory device may include a dedicated interrupt pin for transmitting interrupt signals. Alternatively, the memory device may transmit interrupt signals via a pin also sued to transmit error detection codes. For example, the memory device may transmit an interrupt signal before or after an error detection code or may invert the error detection code to indicate the interrupt, in which case the inverted error detection code may act as an interrupt signal.