给一段描述（要习惯看原文）：
Digital systems follow static discipline: if inputs to the digital system meet valid input thresholds, then the system guarantees its outputs will meet valid output thresholds.
note:
In a digital circuit or system, static discipline defines the "logic high", "logic low", VOH (output high), VOL (output low), VIH (input high) voltages, and noise margin values.
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