How would you influence upstream teams (RTL, synthesis, library) to improve design-data quality for PrimeTime?
From PDVerse PrimeTime STA Interview Guide · pdVerse Mentor Guide
Ten-second Interview Answer
Push the library team toward accurate, complete, correctly-versioned libraries with the node's models, the synthesis team toward clean linkable netlists and a shared constraint source, and establish shared naming and versioning conventions plus a prompt feedback loop.
Complete Technical Explanation
PrimeTime's data quality is determined upstream, so influence has to reach the teams producing the artifacts. With the library team the asks are well-characterised, correctly-versioned libraries with accurate delay tables and the right models for the node, meaning CCS and POCV data; consistent naming; fusion libraries where they simplify a multi-condition setup; clear version control and release notes so the intended libraries are the ones used; and validation that no cells or arcs are missing, since those become unresolved references or wrong timing. With the synthesis team the asks are clean, linkable netlists - no cells the libraries do not provide, and cell naming consistent with the libraries so link_design resolves every instance - plus a shared constraint source so signoff verifies the same constraints synthesis optimised to. With the RTL team it is clean design structure, documented clocking and modes, so the data and constraints are groundable, and STA-friendly design generally. Around all three, agree shared conventions for naming, versioning and handoff formats so data flows into PrimeTime without rework. And close the loop: report data-quality problems - unresolved references, library issues, netlist problems - back upstream promptly so they get fixed at the source rather than patched downstream every run. The argument that carries weight is the direct one: the libraries are the models the analysis computes with and the netlist is the design it assembles, so a defect in either produces wrong PrimeTime results, usually silently.
In Pd / Signoff
Concretely this looks like a handoff checklist enforced at each netlist and library drop - link cleanly with zero unresolved references, library version recorded, naming matching the mapping - and a standing defect channel back to the library and synthesis owners. It changes where debug effort goes: a naming mismatch becomes an upstream ticket rather than a local workaround repeated in every run script.
Common Trap
Absorbing upstream defects locally - hand-patching a link_path or a name mismatch run after run instead of reporting it. The defect stays in the source, every other team hits it too, and because unresolved references and wrong library versions produce no obvious error the same silent corruption keeps reaching other people's results.
Expect Next
Why is a clean, linkable netlist a precondition rather than a nice-to-have from the synthesis team?
Topic And Primetime Commands
Design Data / Netlist & Libraries. link_design, link_pathKeep building interview depth
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