Why don't we consider hold analysis during placement stage?

Question

Accepted Answer

Hold analysis is not considered during placement stage because it is primarily a timing issue and is addressed during the routing stage.

Hold analysis is a timing check that ensures data arrives at the destination flip-flop after the clock edge, without violating the setup time.
During the placement stage, the focus is on meeting the timing constraints related to setup time, while hold time violations are typically addressed during routing.
Considering hold analysis during placement would unnecessarily complicate the placement algorithm and may not be as effective as addressing it during routing.
By addressing hold time violations during routing, the design can be optimized for both setup and hold time constraints.
Tools like static timing analysis (STA) are used during the routing stage to identify and fix hold time violations.

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