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Forum Index : Microcontroller and PC projects : New Pi
| Author | Message | ||||
CaptainBoing Guru  Joined: 07/09/2016 Location: United KingdomPosts: 2171 |
... ish https://www.raspberrypi.org/blog/raspberry-pi-compute-module-4/ Edited 2020-10-20 17:52 by CaptainBoing |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2466 |
with 8gb RAM, wireless, no onboard EMMC, the price is us$75. add to this $35 for the I/O expander brings the total to us$110 (+cost of an SD card). basically this is a small motherboard with full-sized connectors for everything, onboard RTC, and a PCIe x1 slot. all powered from 12v: https://www.raspberrypi.org/products/compute-module-4-io-board/  (image from: https://www.raspberrypi.org/app/uploads/2020/10/Module-and-IO-Board-2_-scaled.jpg this suddenly makes the RPi4 a much more interesting device as a viable intel-PC alternative  cheers, rob :-) Edited 2020-10-20 22:28 by robert.rozee |
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mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 492 |
The one drawback is that there are NO USB3 ports. And that is a deal-breaker for some. You can add PCIe x1 card but to me, that seems bass-ackwards. They call me Shai-Hulud (The maker) |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2466 |
reading through the documentation, it seems that on the standard RPi4 the PICe port is used to implement the two USB3 ports using a PICe to USB3 bridge, "The PCIe link on the Raspberry Pi 4, Model B is used for the USB 3.0 interface via the VLI805 XHCI controller. If the application requires USB 3.0 interface then an external XHCI controller is required like the VLI805.". from: https://datasheets.raspberrypi.org/cm4io/cm4io-datasheet.pdf found here: https://www.raspberrypi.org/products/compute-module-4-io-board/ incidentally, the I/O expander contains a 4 port USB2 hub: two ports you can see on the edge of the board, a header nearby brings out the other two. hopefully someone will come up with a cheap custom PCIe x1 expander card that implements USB3 as well as a few SATA ports. or, the plans to the I/O expander are open-source, so anyone could roll their own. cheers, rob :-) |
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