Understanding setup and hold timing in FPGA design can indeed be challenging, and you're not alone in facing these difficulties. The formula you mentioned is correct, but the devil is often in the details. Let me provide some clarification and references to Intel's Quartus Prime Timing Analysis manual.
Setup Slack: It's the time difference between the required time for data to stabilize (Setup) and the actual arrival time of the data. Mathematically, Setup Slack = Data Required Time (Setup) - Data Arrival Time.
Hold Slack: It's the time difference between the actual arrival time of the data and the required time for the data to remain stable (Hold). Mathematically, Hold Slack = Data Arrival Time - Data Required Time (Hold).
It's important to note that negative slack values indicate a violation of timing constraints, meaning your design may not meet the required timing specifications.
For detailed insights and step-by-step guidance on calculating setup and hold slack using Intel Quartus Prime, I recommend referring to the official documentation. Check the Timing Analysis chapter in the Intel Quartus Prime Handbook, particularly the section on Setup and Hold Timing Analysis.
Additionally, online tools and calculators specific to FPGA timing analysis might be beneficial. Intel's forums and community support are also excellent resources for getting help with specific challenges you're facing.
Remember, FPGA timing analysis concepts often become clearer with practice, so don't hesitate to work through examples and seek community assistance. Best of luck with your FPGA design endeavors!
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