Overall Assessment Summary - 2021.2 English

Vivado Design Suite User Guide: Design Analysis and Closure Techniques (UG906)

Document ID
Release Date
2021.2 English

The summary contains both the QoR Assessment Score and Flow Guidance information.

The assessment score predicts how likely the design is to achieve timing goals at the given point in the implementation flow. The earlier in the flow you run the command, the greater the benefit. There is a small compromise on accuracy but the score should not be greater than one away from the final post-route score. It is generated by analyzing a complex set of design metrics in areas such as UltraFast methodology, device utilization, control sets, clocking, setup slack, and hold slack. In addition, device-specific characteristics are also considered. The scoring range is from 1 to 5. When the score is less than 5, use report_qor_suggestions to improve the score.

Score details are provided in the following table:

Table 1. Report QoR Assessment Scoring
Score Meaning
1 Design is unlikely to complete the implementation flow
2 Design will complete the implementation flow but will not meet timing
3 Design is unlikely to meet timing
4 Design may meet timing
5 Design will easily meet timing

Flow guidance is part of the Overall Assessment Summary. It dynamically updates depending on the current status of the design. It provides information about:

  • Whether you need to address methodology issues
  • Whether the design improves using QoR Suggestions
  • Whether to use ML strategies or Incremental Compile

The following figure shows an example design with a QoR Assessment Score of 2.

Figure 1. Overall Assessment Summary