[Milkymist-devel] M1r4 review: USB (was Re: Ask for reviews on M1R4 draft (was Re: M1R4 draft schematics))
werner at almesberger.net
Thu Mar 15 17:37:37 PDT 2012
In USB, I only found one piece I'm not sure about: the internal connector
- considering  (figure 10 on page 14), shouldn't we mark pin 9
as NC ?
- pin 9 and 10 are marked as USB shield. The above reference has a
completely different idea about it (overcurrent). Shouldn't we
NC it too, and leave shielding aside ?
If you can find one of those little passive commercially available
header to USB A boards (to plug on the mainboard of a PC), perhaps
you could check where they connect the shield.
- if we decide to keep shield on J24, wouldn't it be better to
ground it separately it from the external shields ?
(available in the bookshelf as "usbpwr")
You were looking for a header that already comes polarized. I think
this one may fit:
Non-stock, but only takes one week. Oh, and it's heavy metal ;-)
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