HRR-10004: High Fan-out Non-Global Nets
Description
High fan-outs on non-global nets (in designs using Intel Hyperflex architecture) prevent Intel Quartus Prime Pro Edition software from retiming paths due to path imbalances caused by long or short paths in critical chain.
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.
Parameters
| Name | Description | Type | Default Value | Min Value | Max Value |
|---|---|---|---|---|---|
| fanout | Reports a violation for drivers that have at least the number of fan-outs specified in this parameter | integer | 10000 | 0 |
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
Low
Device Family
- Intel® Agilex™
- Intel® Stratix® 10