Samsung realized that a simple boundary model was insufficient for accurate analysis savings. To achieve a hierarchical sign off flow, they needed additional information covering the design, the design environment, the IP constraints, and the CDC attributes.
One key element to include was clock tree connectivity, as it could be a source of major mismatches between lower and higher levels in the hierarchical flow.
They then aligned their IP submission process to support their new hierarchical flow. This both simplified the IP submission process and improved the IP submission quality.
Further, to make the flow reusable across multiple SoCs, they enabled designers to submit IP meta-databases with one value of the parameters and flow to automatically generate a meta-database for other parameter values. They also embedded IP assumptions in the meta-database to reduce the user effort at higher levels.