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ext/: added uSD extender board (draft)

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Werner Almesberger
2010-11-02 12:17:20 -03:00
parent 979a631ef5
commit 49c76e0f8e
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THIS IS A DRAFT AND COMPLETELY UNTESTED.
The extension board is meant to connect to a 50 mil ribbon cable,
which in turn connects to a connector for a 7x2 100 mil header.
To reduce crosstalk, signals are always separated by ground. We
cannot use VDD for crosstalk suppression, because the device may
be self-powered and VDD would thus be disabled.
If the connector is reversed, VDD is shorted to GND.