: The central 64-bit quad-core processor. In the reduced schematic, this is typically represented as a simplified block with main interface lines.
: The primary source for electrical diagrams. Raspberry Pi 4 Model B Full Schematic
: Includes electrical specifications, power requirements, and GPIO multiplexing modes. : The central 64-bit quad-core processor
This page details the processor's "glue logic": Raspberry Pi 4 Model B Full Schematic
For those looking to dive deeper than the basic schematics, you can reference these authoritative technical documents: