The table includes the following columns:
- ID
- A unique identifier for each source/destination clock pair
- Source Clock
- The originating clock domain
- Destination Clock
- The receiving clock domain
Setup/Recovery (Max Delay) Columns
- Edges (WNS)
- Clock edges used to calculate worst negative slack.
- WNS (Worst Negative Slack)
- The worst slack across all paths between the clock pair.
- Total Negative Slack
- The sum of all negative slack values across failing endpoints.
- Failing Endpoints
- The number of endpoints that fail to meet timing (contributes to TNS).
- Total Endpoints (TNS)
- The total number of endpoints analyzed for the clock pair.
- Path Req (WNS)
- The required time for the path with the worst slack.
Multiple requirements can exist within a clock pair depending on edge
polarity or timing exceptions.
For more information, refer to Path Requirement.
- Clock Pair Classification
- Describes the clock relationship. Refer to Clock Pair Classification for details.
- Inter-Clock Constraints
- Lists the constraints between the clocks, such as
set_false_pathorset_clock_groups. The possible values are listed in Matrix Color Coding. Following are example definitions of these constraints:set_clock_groups -async -group wbClk -group usbClk set_false_path -from [get_clocks wbClk] -to [get_clocks cpuClk]
Hold/Removal (Min Delay) Columns
These appear only if min delay analysis is enabled:
- Edges (WHS)
- Clock edges used to calculate worst hold slack.
- WHS (Worst Hold Slack)
- The worst hold or removal slack for the clock pair.
- THS (Total Negative Hold Slack)
- The sum of hold slack violations across endpoints.
- Failing Endpoints (THS)
- The number of endpoints failing hold/removal timing.
- Total Endpoints (THS)
- Total number of endpoints analyzed for hold/removal timing.
- Path Req (WHS)
- Required time for the path with the worst hold slack. For more information, refer to Timing Analysis.