Asynchronous Radiation-Hardened E-Fuse Macro Design
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Solution Overview
Problem
Current electronic fuses require a clock for synchronous operation, limiting their integration into asynchronous memory designs and high radiation environments, where additional circuitry and components are undesirable.
Innovation Solution
Development of a radiation-hardened electronic fuse that operates asynchronously, utilizing shared functional I/O signals and test signals for control, and is self-timed, eliminating the need for an external clock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If synchronous operation with external clock is used, then e-fuse can be implemented with current technology, but it cannot be integrated into asynchronous memory designs and requires additional clock circuitry
Solution Approach 1:
The patent replaces the mechanical clock signal system with an asynchronous event-driven system. The e-fuse circuit responds to control signals (RESET, READ, WRITE) without requiring a periodic clock, using handshaking protocols and self-timed operations instead of synchronous clocked flip-flops and registers.
Solution Approach 2:
The e-fuse circuit is designed to perform multiple functions (programming, reading, resetting) within a single asynchronous framework, eliminating the need for separate clock circuits for different operations. The same control signals manage all e-fuse functions without requiring synchronous timing.
2Reliability
If radiation hardening techniques are applied, then reliability in high radiation environments improves, but device complexity and additional components increase
Solution Approach 1:
The e-fuse circuit performs self-testing and self-resetting operations without requiring external test equipment or additional radiation mitigation components. The RESET signal initiates self-reset sequences, and the circuit monitors its own state through the READ operation, eliminating the need for separate radiation hardening subsystems.
Solution Approach 2:
The patent combines the radiation hardening features directly into the core e-fuse circuit operations. The asynchronous control mechanism and self-testing capabilities are integrated into the same circuitry that performs normal e-fuse functions, rather than adding separate radiation protection layers.
3Adaptability or versatility
If asynchronous operation is implemented, then integration into asynchronous memory designs is enabled, but control and timing mechanisms become more complex
Solution Approach 1:
The patent uses periodic control signal sequences (RESET followed by READ or WRITE) to manage asynchronous operations. While the overall system is asynchronous, specific sub-operations use standardized signal patterns and handshaking protocols that simplify control logic compared to fully custom asynchronous timing mechanisms.
Data Source
AI summary
A multi-bit, asynchronous e-fuse macro, the macro comprising: an input output enable, a power on reset, a write address, an input write enable, a ground clamp enable, and a write clock; a plurality of e-fuse bits; a supply voltage configured to allow programming at least one of the e-fuse bits; at least one fuse output; and self-timing and control circuitry configured to perform signaling, wherein each of the inputs is in electrical communication with the e-fuse macro.