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Setup/hold, slack, timing paths, corners, and the CDC and OCV questions that come up in senior STA interviews.

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STA interviews test whether you understand not just what setup and hold time are, but how they propagate into real design decisions — constraint writing, exception handling, and sign-off methodology.

This bank moves from fundamentals to the harder judgment questions: false paths, multi-cycle paths, and on-chip variation.

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STA interview questions by subtopic

Setup & Hold Timing

The two constraints every synchronous path must satisfy.

  • Define setup time and hold time, and explain what a violation of each means.
  • How is the maximum operating frequency of a design derived from setup timing?

Slack & Timing Paths

How STA quantifies whether a design meets its constraints.

  • What is slack, and what's the difference between positive and negative slack?
  • What are the four types of timing paths STA analyzes?

Clock Concepts

Skew, jitter, and how clocks are modeled in STA.

  • What is clock skew, and how does it differ from clock jitter?
  • What's the difference between a launch clock and a capture clock?

False & Multi-cycle Paths

Timing exceptions that reflect real design intent.

  • What is a false path, and why would you exclude it from timing analysis?
  • What is a multi-cycle path, and how do you constrain one in SDC?

CDC in STA

Why crossing clock domains needs special handling.

  • Why does STA typically not analyze paths that cross asynchronous clock domains directly?
  • What is a synchronizer, and why does it need special timing exceptions?

On-Chip Variation

Accounting for real-world manufacturing and environmental variation.

  • What is On-Chip Variation (OCV), and why is it applied in sign-off STA?
  • What's the difference between AOCV and POCV?

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