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## Schematics conventions
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## Schematics conventions
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1. Name power P3V3, M5V0, GND, AGND etc.
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1. Name power P3V3, M5V0, GND, AGND etc.
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2. Power symbol for positive supply should point up and those for
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2. Power symbol for positive supply should point up. Those for negative
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negative supplies should point down.
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supplies and GND should point down.
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3. Clock signals, add frequency in name (eg. CLK\_100, CLK20\_VCXO).
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3. Clock signals: add frequency in name (eg. CLK\_100, CLK20\_VCXO).
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4. Negative signal names: suffix \_N (e.g. PB\_RESET\_N), do not use
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4. Unused signals available on connectors (e.g. P12V, VADJ): do not
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connect a wire to them, leave open.
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5. Negative signal names: suffix \_N (e.g. PB\_RESET\_N), do not use
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over-line that disappears in text files.
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over-line that disappears in text files.
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5. Use same page size (e.g., A3) for all schematics pages.
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6. Use same page size (e.g., A3) for all schematics pages.
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## Documentation
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## Documentation
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1. Check that each schematics page has on the same place the [Open
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1. Check that each schematics page has on the same place the [Open
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Hardware Licence
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Hardware Licence
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text](https://www.ohwr.org/project/cernohl/uploads/8eaab7317d1719b8dda14bbe796c4ebc/cern_ohl_v_1_2_howto.pdf):
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text](https://www.ohwr.org/project/cernohl/uploads/8eaab7317d1719b8dda14bbe796c4ebc/cern_ohl_v_1_2_howto.pdf):
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"Copyright mycompany 2016. This documentation describes Open
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"Copyright mycompany 2017. This documentation describes Open
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Hardware ..."
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Hardware ..."
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- This text can be found in the 'howto' file at [CERN OHL
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- This text can be found in the 'howto' file at [CERN OHL
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version 1.2](https://www.ohwr.org/project/cernohl/wikis/Documents/CERN-OHL-version-1.2)..
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version 1.2](https://www.ohwr.org/project/cernohl/wikis/Documents/CERN-OHL-version-1.2)..
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