ECC Decoder Fault Detection Circuit for Silent Data Mismatch

The patent creates a simplified copy of the ECC decoder's error detection functionality rather than implementing a full redundant decoder. The detection circuit replicates only the essential error detection logic needed to verify ECC operations, significantly reducing the hardware overhead while maintaining fault detection capability. This selective copying approach resolves the contradiction by providing reliability improvement through redundancy while minimizing the die size penalty.

The patent segments the ECC decoder functionality into separate components: the main ECC decoder and a独立的 detection circuit. The detection circuit is further segmented into specific modules that monitor different aspects of ECC operation (error detection signals, correction signals, data paths). This segmentation allows the system to achieve reliable fault detection through targeted monitoring without requiring a complete redundant decoder, thus reducing die size while maintaining reliability.

The detection circuit implements a lightweight copy of only the necessary error detection logic rather than a full redundant decoder. This selective replication significantly reduces the active transistors and logic gates that consume power, while still providing comprehensive monitoring of ECC operations. The power consumption is reduced because the detection circuit processes only error status signals rather than performing full decoding operations.

By segmenting the monitoring functionality into a separate, dedicated detection circuit with specialized modules, the patent enables independent optimization of power consumption. Each segment of the detection circuit is designed to monitor specific ECC signals with minimal power overhead, avoiding the excessive power consumption that would result from running a complete redundant decoder at full operational capacity.

The patent copies only the essential error detection functionality from the ECC decoder into a separate detection circuit, rather than implementing a complete redundant decoder. This selective copying simplifies the overall device architecture by avoiding the complexity of duplicating the entire decoder logic, while still achieving reliable fault detection through monitoring of critical error and correction signals.

The patent segments the system into a main ECC decoder and a separate, simplified detection circuit with specialized monitoring modules. This segmentation reduces device complexity by isolating the complex decoding logic from the monitoring logic, allowing each component to be optimized independently. The detection circuit's segmented structure makes it easier to verify and maintain than a fully redundant decoder would be.

The detection circuit acts as an intermediary monitoring layer between the ECC decoder and the rest of the system. It observes error detection signals and correction signals from the decoder without interfering with the primary decoding function, and generates fault indicators when anomalies are detected. This intermediary approach adds minimal complexity while significantly improving reliability by providing continuous monitoring of ECC operations.

The detection circuit implements feedback monitoring of the ECC decoder's error detection signals and correction signals. When the detection circuit identifies inconsistent or suspicious patterns in these feedback signals (such as unexpected error declarations or correction behaviors), it generates fault indicators that can trigger system-level error handling. This feedback mechanism provides reliable fault detection with minimal added complexity by leveraging existing ECC signal paths.