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Forum Post: Change IR-DROP constraint (70% of VDD) in Tempus

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Hello, I'm usingTempus (v. 15.14) to perform time analysis using IR-DROP (from Voltus). I read the IR-DROP file (.iv) using: "read_instance_voltage -min -ir_drop myfile.iv" (OK) However, when I perform "report_timing", I got an warning: **WARN: (IMPESI-2012): The instance U3_INST_next_reg_5_ has an IR drop voltage(0.68122V) which is less than 70% of nominal vdd(1V). Ignoring IR drop for this instance and using 70% of nominal voltage vdd(1V) from the IR drop file which is 0.7V as voltage. My question: Is there a way to change this constraint of 70% of VDD? I work with radiation and I would like to see the effects for bigger IR-DROPS. Thank you in advance, Raphael

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