Issue link: https://resources.pcb.cadence.com/i/1180526
PSpice A/D User Guide DC analyses October 2019 487 Product Version 17.4-2019 © 2022 All Rights Reserved. analog/digital devices are forced to the X value, and more iterations are done. Since X as input to a digital component gives X as output, the Boolean equations can always be solved this way. If a digital node cannot be driven by known values during the DC iterations (for instance, the output of a flip-flop with the clock line held low), then its DC state will be X. Depending on the circuit, some, none, or all of the digital nodes may have the state X when the bias point is calculated.