port is now truly gigabit-capable. Previous models were limited because the Ethernet was routed through the USB 2.0 bus, but the Pi 4 schematic gives it its own dedicated interface to the SoC. The standard 40-pin header
The schematic shows two independent HDMI blocks connected directly to the BCM2711's video core.
So, download the PDF, zoom in on that PMIC block, and take a moment to appreciate the "blueprint" of the world's favorite single-board computer.
It interfaces with the BCM2711 via an (Reduced Gigabit Media Independent Interface) bus. Raspberry Pi 4 Model B Full Schematic
Older models encapsulated Ethernet within the USB controller. The Pi 4 schematic features a dedicated .
– The CM4 I/O board has full schematics available. The CM4 itself still lacks BCM2711 internal connections, but the carrier board is fully documented.
The schematic interfaces with a specialized, ceramic cavity antenna built directly into the board layout, eliminating the need for an external wire antenna for standard use cases. 6. The 40-Pin GPIO Header Reference port is now truly gigabit-capable
. This System-on-Chip (SoC) replaced the older designs with a 64-bit quad-core ARM Cortex-A72 processor. Raspberry Pi Architecture Upgrade: The schematic shows the SoC now includes a dedicated
The schematic highlights inline Electrostatic Discharge (ESD) protection diode arrays protecting the TMDS data lines on both HDMI ports.
The central block in the schematic is the Broadcom BCM2711. Unlike the Pi 3's BCM2837, this chip includes a quad-core ARM Cortex-A72 processor running at 1.5GHz. The schematic details the voltage rails feeding this chip: there are separate lines for the ARM core (VDD_CORE), the I/O (VDD_IO), and the PLLs (Phase-Locked Loops). The KiCad files show the decoupling capacitors (usually 0.1uF and 10uF) placed physically close to the chip to filter noise. So, download the PDF, zoom in on that
Practical notes:
) on the CC1 and CC2 lines. This ensures universal compatibility with electronically marked (E-marked) USB-C cables and smart chargers. The MaxLinear MxL7704 PMIC