HRR-10003: Registers on High Fan-Out Non-Global Nets

High fan-outs on non-clock global nets (in designs using Intel® Hyperflex™ architecture) prevent the Compiler from retiming paths due to path imbalances caused by long or short paths in critical chain.

Recommendation

Duplicate high fan-out driver registers. Refer to DUPLICATE_REGISTER and DUPLICATE_HIERARCHY_DEPTH assignments for automated solutions. Alternatively, you can edit the RTL to create duplicate copies.

If you edit the RTL, apply the preserve_syn_only attribute to duplicate registers and assign the duplicates to individual instances in the fan-out hierarchy.

Severity

Medium

Stage

Place

Device Family

  • Intel® Stratix® 10
  • Intel® Agilex™