TMC-20204: Endpoints of Paths Failing Setup Analysis with Retiming Restrictions

Description

Violations of this rule identify endpoints of paths that fail setup analysis with retiming restrictions. A path that fails setup analysis might not be fully optimized by the retimer if either of the endpoints have a retiming restriction.

Parameters

Name Description Type Default Value Min Value Max Value
maximum_setup_slack Reports a violation for timing paths that have a setup slack below the value of this parameter. double 0.0    
to_clock_filter Reports a violation for timing paths that end at a register in a clock domain that matches the value of this parameter. string *    
minimum_number_of_adders Reports a violation for timing endpoints that are preceded by a number of independent adder chains greater than or equal to this value. integer 3    
minimum_number_of_soft_mult_chains Reports a violation for timing endpoints that are preceded by a number of independent adder chains that are implementing multiplier logic greater than or equal to this value. integer 2    

Recommendation

Consider removing these retiming restrictions to allow retiming optimizations to improve performance. Refer to Retiming Restrictions and Workarounds in the Intel Hyperflex Architecture High-Performance Design Handbook for more information. Also refer to the Fast Forward Timing Closure Recommendations report for step-by-step suggestions for RTL changes and estimated performance improvement.

Severity

Medium

Tags

Tag Description
retime Design rule checks which pertain to the Compiler's Retime stage.

Device Family

  • Intel®Stratix® 10
  • Intel®Agilex™
  • Intel®Arria® 10
  • Intel®Cyclone® 10 GX