TMC-20205: Endpoints of Paths Failing Setup Analysis with Explicit Power-Up States that Restrict Retiming
Description
Violations of this rule indicate endpoints of paths that fail setup analysis with explicit power-up states that might restrict retiming. A path might not be fully optimized by the retimer if either of its endpoints has a power-up state. Refer to Initial Power-Up Conditions in the Intel Hyperflex Architecture High-Performance Design Handbook for more information.
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 applying the IGNORE_REGISTER_POWER_UP_INITIALIZATION ON setting to registers or their hierarchy to allow retiming optimizations to improve performance.
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