The official schematic for the Raspberry Pi 4 Model B (revision 1.2, 1.4, and 1.5) is released by (formerly the Raspberry Pi Foundation) under a non-commercial license. It is distributed as a PDF file within the Raspberry Pi Hardware Reference repository on their official website and GitHub. Users should note that while the schematics are publicly accessible, the board’s physical layout (Gerber files) and the proprietary bootloader code are not fully open source.
For the first time, the Ethernet controller is not bottlenecked by the USB bus. The schematic reveals a dedicated RGMII interface for the Gigabit Ethernet. Via Labs VL805 PCIe to USB 3.0. Networking: Broadcom BCM54213PE Gigabit PHY. Throughput: Full 1Gbps speeds are now achievable. Dual Display Architecture Raspberry Pi 4 Model B Full Schematic
: Provides the electrical specifications and pinout details. The official schematic for the Raspberry Pi 4