This paper presents circuit level models that explain the extra combinational delays in a SRAM-based FPGA (Virtex-5) due to Single Event Upsets (SEUs). Several scenarios of extra combinational delays are simulated based on the circuit architecture of the FPGA core, namely Configurable Logic Blocks (CLBs) and routing. It is found that the main delay contribution originates from extra interconnection lines that are unintentionally connected to the main circuit path via pass transistors activated by SEUs. Moreover, longer delay faults observed on Input/Ouput Blocks (IOBs) due to SEU were investigated through simulations. In all cases, results are in close agreement with the ones obtained experimentally while exposing the FPGA to proton irradiation. Index Terms-Configurable logic element, extra combinational delays, IBIS model, Input/Ouput Blocks (IOBs), observed delay change (ODC), single event upset (SEU), SRAM-based FPGA.
This paper presents an automated algorithm for optimum configuration of routing interconnection network in Xilinx Zynq-7000 All programmable system-on-chip (APSoC) fabrics. A method to configure circuits with optimum routing resources is presented along with their performance parameters with and without the proposed algorithm. The proposed algorithm enables full control over routing resources for using different interconnection types in order to create routing-based circuit-undertest. The algorithm proposes the routing techniques through the 2-D array of switch matrices inside the interconnection network and automatically identifies the involved programmable interconnection points associated with a node. An experimental setup is proposed to measure the performance parameters such as slack time and power with and without the applied algorithm on the APSoC routing resources. The proposed setup requires no external equipment such as manufactured equipments or external instruments for performance measurement.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.