TMC-20210: Paths Failing Setup Analysis with High Routing Delay Added for Hold
Description
Violations of this rule identify paths that fail setup analysis with high routing delay added for hold. During routing, the Fitter may add wire between register paths to increase delay to meet hold time requirements. Excessive additional wire can indicate an error with the constraint. The cause of such errors is typically incorrect multicycle transfers between multi-rate clocks, and between different clock networks.
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
Review the timing paths to determine whether the Fitter adds excessive wire to meet hold timing. Verify that timing constraints, especially multicycles, are set properly. Refer to Wires Added for Hold in Intel Quartus Prime Pro Edition User Guide: Design Optimization for more information.
Severity
Medium
Tags
| Tag | Description |
|---|---|
| route | Design rule checks which pertain to the Compiler's Route stage. |
Device Family
- Intel®Stratix® 10
- Intel®Agilex™
- Intel®Arria® 10
- Intel®Cyclone® 10 GX