Raspberry Pi 4 Compute Module Carrier Boards

The brilliant thing about the ECP5 ULX4M is that it can be mounted on a large number of commercially available carrier boards. Whatever your needs, you can probably avoid designing a complete circuit board, by reusing one of the existing carrier boards, or by making small changes to an existing carrier board.

Here is a huge list of Raspberry Pi Compute Module 4 Carrier boards. While. the title says "Raspberry Pi PCIe Database", really it is a list of carrier boards, a small part of a larger PCIe web site. Only the ones that look like they can be plugged into a computer back plane are actually for PCIe. The rest include everything you could ask for. Small ones, big ones, ones with cases, displays, clusters for many compute modules, game pads, and other things. Below are mentioned two of the more important ones for ULX4M users. If you are using different carrier board with the ULX4M, please let me know and I will add it.

Tofu is the carrier board recommended by Intergalaktik, the producers of the ULX4M. For early releases it is best to use the carrier board used by the ULX4M team.

Standard Raspberry Pi 40 pin GPIO header

Gigabit Ethernet port with PoE through the official Raspberry Pi PoE HAT

M.2 2242/3042 socket (key B) with micro SIM card holder. See compatibility list

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3x USB-A ports
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Full size HDMI port
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Camera and display ports (newer 22pin version, flexible adapter cables can be purchased separately here)

Two power inputs for industrial connectors (2.1mm barrel and standard 3.5mm terminal block)

Large input voltage range, from 7.5 to 28V. Also available on 3x1 header pins for sharing to HATs requiring higher voltages (recommended power rating: >24W)

Micro SD card slot. Only used for CM4Lite (no eMMC memory)

USB-C port to use it as an OTG device and for programming purposes. May also be used to power the CM4, with power constraints if used with peripherals

Circuit protections added for safety reasons (ESD, over- and reverse-current protections)

Standard Raspberry Pi, CM4 and 4 additional M3 mounting holes for design flexibility

Official Raspberry Pi Carrier Board The image is of the official Raspberry Pi carrier board.

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External power connector (+12V, +5V)
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2 x full-size HDMI® 2.0 connectors
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2 x USB 2.0 connectors, with header for two additional connectors

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Gigabit Ethernet RJ45 with PoE support
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Micro USB socket for updating Compute Module 4

MicroSD card socket for Compute Module 4 Lite (without eMMC) variants

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PCIe Gen 2 x1 socket
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Standard fan connector
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2 x MIPI DSI display FPC connectors (22-pin 0.5 mm pitch cable)

2 x MIPI CSI-2 camera FPC connectors (22-pin 0.5 mm pitch cable)

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Standard Raspberry Pi HAT connectors
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Real-time clock with battery socket and ability to wake Compute Module 4

Various jumpers to disable specific features, e.g. wireless connectivity, EEPROM writing

Or if all else fails, design your own carrier board in KiCad.

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