Negative logic interpretation: In a negative-logic assignment, the logic HIGH (logical “1”) is represented by the low-voltage level (often written as 0), and logic LOW (logical “0”) is represented by the high-voltage level. Judge the given statement: “In a negative logic system, a high is represented by 0.”

Introduction / Context:
Logic “polarity” defines how electrical levels map to logical values. In positive logic, a higher voltage means logical 1; in negative logic, the mapping is reversed. Many interfaces (e.g., active-low reset) intentionally use negative logic.

Given Data / Assumptions:

• Negative logic definition: low voltage corresponds to logic 1; high voltage corresponds to logic 0.
• “High” in the sentence refers to the logical concept (logic 1), not necessarily high voltage.
• Voltage thresholds are still defined by the technology family.

Concept / Approach:
The assignment is a naming convention. Nothing physical changes in the device; we simply decide which electrical level denotes each logical value. Therefore, under negative logic, a logic 1 is indeed the lower electrical level. Designers often mark signals with an overbar or a trailing “_n” to indicate active-low semantics.

Step-by-Step Solution:

Verification / Alternative check:
Consider an active-low reset_n input: asserting reset requires driving a low level (logical 1 under negative logic), deasserting reset means high level (logical 0 under negative logic).

Why Other Options Are Wrong:
“Incorrect” would deny the formal definition of negative logic. Technology family distinctions do not change the convention.

Common Pitfalls:
Confusing “high voltage” with “high logic.” Always specify signal polarity to avoid misunderstanding in schematics and firmware.

Final Answer:
Correct