kreyren/OSHW-System-On-Module
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Fix broken img links

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Jacob Hrbek 2023-08-04 02:43:43 +02:00 committed by Gitea
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README.md
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@ -17,24 +17,24 @@ The inspiration comes from OLIMEX's SODIMM-204 project which is a solution of tw
Board with 4~12+ layers of restricted size that includes the chip, RAM and optionally chip-specific components such as the [OLIMEX A20-SOM204](https://www.olimex.com/Products/SOM204/A20/A20-SOM204): Board with 4~12+ layers of restricted size that includes the chip, RAM and optionally chip-specific components such as the [OLIMEX A20-SOM204](https://www.olimex.com/Products/SOM204/A20/A20-SOM204):
![image](/attachments/612f40b3-91d0-48e3-bb4d-d6cfc680e335) ![image](https://git.dotya.ml/attachments/612f40b3-91d0-48e3-bb4d-d6cfc680e335)
Notice that it's a PCB with restricted size that only has the chip, RAM, eMMC, SDCard and then has an edge connector to fit in SODIM-204 connector. Notice that it's a PCB with restricted size that only has the chip, RAM, eMMC, SDCard and then has an edge connector to fit in SODIM-204 connector.
For clarity it's this connector, often used for RAM sticks in notebooks: For clarity it's this connector, often used for RAM sticks in notebooks:
![image](/attachments/5281a7b2-4c1a-4511-af1b-db5b8706a04a) ![image](https://git.dotya.ml/attachments/5281a7b2-4c1a-4511-af1b-db5b8706a04a)
**Platform Board** **Platform Board**
Board with SODIMM-204 connector that the Module Board slots in such as the [OLIMEX A20-SOM204-EVB](https://www.olimex.com/Products/SOM204/A20-SOM204-EVB) which then adds various devices (Ethernet, PCIe, GPIO, Battery, HDMI, etc..) Board with SODIMM-204 connector that the Module Board slots in such as the [OLIMEX A20-SOM204-EVB](https://www.olimex.com/Products/SOM204/A20-SOM204-EVB) which then adds various devices (Ethernet, PCIe, GPIO, Battery, HDMI, etc..)
![image](/attachments/5b7e32aa-e58e-453c-8195-7baa3bce57bb) ![image](https://git.dotya.ml/attachments/5b7e32aa-e58e-453c-8195-7baa3bce57bb)
which declares the standard for the DDR3 SODIMM 204 pin connector as: which declares the standard for the DDR3 SODIMM 204 pin connector as:
![image](/attachments/5208894f-6201-4870-86be-59ace8b0ab7a) ![image](https://git.dotya.ml/attachments/5208894f-6201-4870-86be-59ace8b0ab7a)
that can then be used to design anything from drones, tablets, cluster servers, etc.. on a platform board PCB that is 1~4 layers and costs around 25 EUR to fabricate. that can then be used to design anything from drones, tablets, cluster servers, etc.. on a platform board PCB that is 1~4 layers and costs around 25 EUR to fabricate.
@ -58,17 +58,17 @@ The obvious solution would be to use DDR5 SODIMM which has 262pins, but that sti
Lets imagine that we have [OLIMEX OlinuXino-A64](https://www.olimex.com/Products/OLinuXino/A64/A64-OLinuXino/open-source-hardware) board as an example: Lets imagine that we have [OLIMEX OlinuXino-A64](https://www.olimex.com/Products/OLinuXino/A64/A64-OLinuXino/open-source-hardware) board as an example:
![image](/attachments/15b998d5-eaa8-49bb-8a8b-6bf33adf88e6) ![image](https://git.dotya.ml/attachments/15b998d5-eaa8-49bb-8a8b-6bf33adf88e6)
Imagine having an edge connector.. Imagine having an edge connector..
For clarity edge connector are contact points on the edge of PCBs designed to slot into a connector, often used on PCIe x16 graphics cards used for desktop computers: For clarity edge connector are contact points on the edge of PCBs designed to slot into a connector, often used on PCIe x16 graphics cards used for desktop computers:
![image](/attachments/54bd7c9b-b9d6-49ac-9965-5e1fb7d6ee55) ![image](https://git.dotya.ml/attachments/54bd7c9b-b9d6-49ac-9965-5e1fb7d6ee55)
.. on one side: .. on one side:
![image](/attachments/3117b88e-9936-465b-adf7-7b9664da5adb) ![image](https://git.dotya.ml/attachments/3117b88e-9936-465b-adf7-7b9664da5adb)
(note that contacts are on both sides of the PCB) (note that contacts are on both sides of the PCB)
@ -76,7 +76,7 @@ This would efectivelly enable OSHW manufacturers to adjust their SBCs so that th
The issue with this solution is that the edge connectors have to have a bevelled edge to help guide them to the connector: The issue with this solution is that the edge connectors have to have a bevelled edge to help guide them to the connector:
![image](/attachments/f596d7db-ce35-49f9-8584-ff8e0fcc1ad5) ![image](https://git.dotya.ml/attachments/f596d7db-ce35-49f9-8584-ff8e0fcc1ad5)
which adds extra cost (seems to be a minor added cost for fabrication) which adds extra cost (seems to be a minor added cost for fabrication)