The architecture every derivative starts from: the platform's blocks and subsystems, its interconnect, memory map, clocking, power and security structure, and where derivatives may add, remove or resize parts.
Architecture Work product in the Platform and derivative products lifecycle
It is the contract between the platform and its derivatives. Derivative teams change only what it allows, IP and software teams build to it, and conformance is judged against it, so a reference that leaves the variation rules unclear invites every derivative to diverge.
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