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# Electronic Design
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While designing a board, quite a few details should be taken into
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account. This wiki intends to provide a meeting point for common
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electronic problems, providing references to already in market
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solutions.
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<table>
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<tbody>
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<tr class="odd">
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<td><strong>Topic</strong></td>
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<td><strong>Wiki</strong></td>
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</tr>
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<tr class="even">
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<td>0</td>
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<td>[Logic families](/Logic-families)</td>
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</tr>
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<tr class="odd">
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<td>1</td>
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<td>[The importante of being a pullup/pulldown resistor](/good-pu-pd)</td>
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</tr>
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<tr class="even">
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<td>2</td>
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<td>[Grounding properly](/grounding-properly)</td>
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</tr>
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</tbody>
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</table>
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## **Logic families**
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Several ideas are clarified:
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- Interoperability between different logic levels. Provide simple
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solutions that allow the designer to reduce stock expenses by
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simplifying the BOM.
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- Ways of choosing a correct input buffer stage compatible with
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different voltage supplies.
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- Patterns to design reliable output driving stages, totally
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glitch-free. Reference to commercial solutions are offered.
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## **The importance of being a pullup/pulldown resistor**
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Choosing a pullup/pulldown resistor is usually seen as simple as "put a
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4K7". This approach is not always correct, and we show how to choose the
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proper one for correctly interfacing with Spartan 6 family.
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## **Grounding properly**
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No way better of being grounded that having poor grounds. Several ideas
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are covered, taking into account:
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- Frecuency of signals.
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- Grounding schemas.
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- Addons for better grounding and good signal quality in
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transmissions.
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-----
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Carlos Gil Soriano - 15 May 2012
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