I'm trying to build the following part of a circuit:
I'm wondering what the part is that has "HI" written on it; I couldn't find it in any PSpice guide.
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'HI' would probably indicate a high voltage level, or logic-level high, also known as Vcc, usually 1.8 V, 3.3 V or 5 V.
It's up to the designer to determine what value 'HI' is, and it is probably located somewhere else on the schematic.
Also that is a port, it indicates that the two nets are tied together in the schematic, without them being wired together directly (thus making a rats nest of wires).