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PSpice A/D User Guide Digital simulation October 2019 647 Product Version 17.4-2019 © 2022 All Rights Reserved. Table 14-13 Simulation condition messages—hazards Message type Severity level Meaning AMBIGUITY CONVERGENCE WARNING Convergence of conflicting rising and falling states (timing ambiguities) arrived at the inputs of a primitive and produced a pulse (glitch) on the output. See Chapter 16, "Digital worst-case timing analysis" for more information. CUMULATIVE AMBIGUITY WARNING Signal ambiguities are additive, increased by propagation through each level of logic in the circuit. The ambiguities associated with both edges of a pulse increased to the point where they overlapped, which PSpice A/D reports as a cumulative ambiguity hazard. See Chapter 16, "Digital worst-case timing analysis" for more information. SUPPRESSED GLITCH WARNING Pulse applied to the input of a primitive that is shorter than the active propagation delay was ignored by PSpice A/D; significance depends on the nature of the circuit. There might be a problem either with the stimulus, or with the path delay configuration of the circuit. See Chapter 16, "Digital worst-case timing analysis" for more information. NET-STATE CONFLICT WARNING Two or more outputs attempted to drive a net to different states, which PSpice A/D reports as an X (unknown) state. This usually results from improper selection of a bus driver's enable inputs. ZERO-DELAY- OSCILLATION FATAL Output of a primitive changed more than 50 times within a single digital time step. PSpice A/D aborted the run. DIGITAL INPUT VOLTAGE SERIOUS Voltage on a digital pin was out of range, which means PSpice A/D used the state with a voltage range closest to the input voltage and continued the simulation. PERSISTENT HAZARD SERIOUS Effects of any of the aforementioned logic hazards were able to propagate to either an external port or to any storage device in the circuit. See Persistent hazards on page 644 for more information.