qi-hardware/ben-blinkenlights
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ben-blinkenlights/ext
History
Werner Almesberger 49c76e0f8e ext/: added uSD extender board (draft)
2010-11-02 12:17:20 -03:00
..
ext.cmp ext/: added uSD extender board (draft) 2010-11-02 12:17:20 -03:00
ext.pro ext/: added uSD extender board (draft) 2010-11-02 12:17:20 -03:00
ext.sch ext/: added uSD extender board (draft) 2010-11-02 12:17:20 -03:00
Makefile ext/: added uSD extender board (draft) 2010-11-02 12:17:20 -03:00
README ext/: added uSD extender board (draft) 2010-11-02 12:17:20 -03:00

README 

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.