Abstract
With the IEC 62.132 proposal, the roadmap for standardization of Electromagnetic (EM) immunity measurement methods has reached a high degree of success. The same understanding can be taken from the MIL-STD-883 H for Total Ionizing Dose (TID) radiation. However, no effort has been made to measure the behavior of electronics operating under the combined effects of both, EM noise and TID radiation. For the reasons pointed out, the combined-effect measurements should be mandatory when dealing with Systems-on-Chip (SoCs) devoted to critical applications. In this paper, we present a configurable platform devoted to perform combined tests of EM immunity and TID radiation of SoCs according to the international standards.
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Notes
The Plasma microprocessor is a Von Neumann 32-bit RISC architecture that can be downloaded from the public domain www.opencores.org. The Plasma is implemented in VHDL and has, with exception of the load/store instruction, an instruction set compatible to the MIPS architecture.
The Plasma’s RTOS adopts the preemptive scheduling algorithm with priority support and provides a basic mechanism able to detect faults that cause misbehavior of the RTOS’s essential services, such as stack overflow and timing violations. This mechanism is implemented by a function named assert(), which is called every time a RTOS service is run. When the argument of the assert() function is false, the RTOS sends an error message through the standard output. Therefore, more RTOS services are solicited by a given application program, higher is RTOS capability to detect faults.
It should be noted that as postulated in the literature [15], the accumulated radiation (TID) on ICs has as consequence the reduction of the MOS transistor threshold voltage (Vth). This phenomenon gradually reduces the (IDS) current drive capability of pMOS transistors and increases the one for nMOS devices. From this, the IC is more prone to suffer from timing (delay) faults.
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Acknowledgments
This work has been partially funded by CNPq (Science and Technology Foundation, Brazil) under contracts n. 301726/2008-6 and n. 490547/2007-9.
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Benfica, J., Bolzani Poehls, L.M., Vargas, F. et al. A Test Platform for Dependability Analysis of SoCs Exposed to EMI and Radiation. J Electron Test 28, 803–816 (2012). https://doi.org/10.1007/s10836-012-5334-z
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DOI: https://doi.org/10.1007/s10836-012-5334-z