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add: POST code hardware
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tuxuser committed May 5, 2024
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1 change: 1 addition & 0 deletions docs/NAVIGATION.md
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- [Devkit types](console-models/devkit-types.md)
- Hardware
- [CPU](hardware/cpu.md)
- [POST](hardware/post.md)
- [Southbridge](hardware/southbridge.md)
- [eMMC / Flash](hardware/emmc-flash.md)
- [Facet](hardware/facet.md)
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22 changes: 22 additions & 0 deletions docs/hardware/post.md
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# POST

[POST](https://en.wikipedia.org/wiki/Power-on_self-test) codes on Xbox are sent by the southbridge via I2C to an *optional* MAX6958 IC to be displayed via 4x 7-Segment-Displays.

I2C Address: *0x38*

f.e. I2C SDA/SCL pads from [FACET connector](./facet.md) or [RF Unit](./rf-unit.md) can be used.

![7Segment Displays](../_files/post/7_seg_lighted.jpg)

## Schematic

![MAX6958 schematic](../_files/post/max6958_7seg_schematic.png)

## POST Codes

**TBD**

## References

- [MAX6958 Datasheet](https://www.analog.com/en/products/max6958.html)
- [MAX6958 Display module](https://oshwlab.com/marten_7544/max6958) - Open source design by Martin Feldtmann

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