Fuse Data Reset Propagation for Safe Flip-Flop Initialization
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Solution Overview
Problem
Existing integrated circuit designs face challenges in reliably initializing flip flops and distributing fuse data, often requiring pipeline flops and technology-dependent synchronizers, leading to variations in failure rates and design complexity.
Innovation Solution
The method involves loading fuse data during a specific clock frequency, disabling and then reactivating the clock signal to propagate the data without the need for pipeline flops, ensuring safe distribution throughout the integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronizers are used to synchronize asynchronous fuse signals, then reliability of signal synchronization is improved, but design complexity increases and failure rates vary across different technologies
Solution Approach 1:
The patent extracts and eliminates the synchronizer component from the design by using a global reset signal that is distributed through existing reset logic. This removes the need for technology-dependent synchronizer libraries and their associated metastability analysis, thereby reducing design complexity while maintaining synchronization reliability through the universal reset mechanism.
Solution Approach 2:
The global reset signal serves multiple functions: it resets scan chains, initializes flip-flops, and synchronizes fuse signal distribution across different domains simultaneously. This multi-functional approach replaces the need for separate synchronizers in each domain, reducing overall design complexity while ensuring reliable synchronization across all technologies.
2Reliability
If pipeline flops are used to distribute fuse data, then data distribution reliability is improved, but power consumption and design complexity increase
Solution Approach 1:
The patent removes pipeline flops from the fuse data distribution path by using the global reset signal to initialize destination flip-flops directly. This eliminates the continuous power consumption associated with pipeline flops while maintaining reliable data distribution through the reset-driven initialization mechanism.
Solution Approach 2:
The global reset signal is activated before fuse data distribution to pre-initialize all destination flip-flops to a known state. This preliminary action ensures reliable data distribution without requiring pipeline flops to maintain data across clock cycles, thereby reducing power consumption while preserving distribution reliability.
3Reliability
If technology-dependent synchronizer libraries are used, then signal synchronization is achieved, but adaptability across different technologies decreases
Solution Approach 1:
The global reset signal provides a universal synchronization mechanism that works across all technologies and process nodes. Unlike technology-specific synchronizer libraries, the reset signal is a fundamental digital signal that behaves consistently across different technologies, thereby achieving signal synchronization while maintaining high adaptability and portability of the design.
Solution Approach 2:
Instead of using complex synchronizer circuits to handle asynchronous signals, the patent inverts the approach by using a global reset signal to force synchronous initialization of all flip-flops. This inverted methodology simplifies the synchronization problem and makes it technology-independent, improving adaptability across different process nodes and technologies.
Data Source
AI summary
Methods, apparatus, and fabrication techniques relating to improved propagation of fuse data through an integrated circuit device during scan shift reset. In some embodiments, the methods comprise loading a first value of at least one fuse bit to an integrated circuit device, during a time period when a clock signal having a first frequency is provided to at least one component of the integrated circuit device; disabling a scan shift after the loading of the first value; inactivating the clock signal after the loading of the first value; propagating the first value of the at least one fuse bit to the at least one component of the integrated circuit device; and reactivating the clock signal after the propagation of the first value.