1. CM4 connector
   Fits all Compute Module 4 model variants.
2. Power/programming
   5V/2.5A power supply, or used for flashing eMMC
3. DISP
   MIPI DSI display port
4. FAN
   For connecting a cooling fan, allows speed control and measurement.
5. CAM
   2x MIPI CSI camera ports
6. HDMI0 connector
   HDMI0 port, supports 4K 30fps output
7. USB 2.0 ports
   2x USB 2.0 ports for connecting various USB devices
8. Gigabit Ethernet connector
   Gigabit Ethernet RJ45 connector, 10 / 100 / 1000M network support
9. M.2 indicator
   Indicates the operating status of the M.2 interface
10. ACT indicator
    Indicates the operating status of the Raspberry Pi
11. PWR indicator
    Indicates the power supply status of the Raspberry Pi
12. BOOT selection
    ON: CM4 boots from the USB-C connector.
    OFF: CM4 boots from eMMC or Micro SD card.

13. 40PIN GPIO connector
14. Micro SD card slot
    For attaching a Micro SD card with a pre-flashed image (ONLY for Lite version).
15. HDMI1 FFC connector
    HDMI1 port, supports 4K 30fps output
16. USB 2.0 FFC connector
    Can be connected via an adapter
17. FE1.1S
    USB HUB chip that expands one USB port into 4 ports.
18. M.2 slot
    Supports various NVME SSDs or communication modules with a PCIE M.2 KEY-M interface.

Links