1. Purpose of the gate
The Partitioning freeze closes the System Partitioning & Package Architecture stage. After it, die teams, the interface team and the package team start working in parallel on the basis of the frozen split. Changing the partitioning after this point means redesigning interfaces, bump maps and possibly the package, so the gate exists to make sure the split is sound before that parallel work begins.
The review checks three criteria: die partitioning reviewed and approved; integration technology chosen with its supplier; and power and thermal estimates within the package's limits. Behind those criteria sit the partitioning specification, the integration technology selection and the package feasibility study, all of which gate this review.
After the freeze, the partitioning moves to the Frozen maturity step: changes affect other dies or the package and need formal approval.
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