1. A method for enabling a multimedia routing path in a single-chip integrated system, the method comprising: configuring, by a processor within the single-chip integrated system, a subsystem of a plurality of subsystems in the single-chip integrated system by writing to a configuration register via an unsecured bus to select an input source and an output destination for the subsystem; validating the selected input source and the selected output destination for the subsystem by writing to a security register by a security processor within the single-chip integrated system via a secure bus that is different from the unsecure bus; and writing to the security register to indicate whether the processor or the security processor is allowed to load descrambling keys into a key memory, wherein the subsystem of the plurality of subsystems is a descrambling block.