> On Mar 29, 2017, at 1:25 PM, Paul Koning via cctalk <cctalk@classiccmp.org> > wrote: > > ... > SD cards are not SPI, they are a variation of MMC.
Sorry about that, it turns out I was working from obsolete memories. That used
to be true, isn't any longer.
In any case, you're dealing with pretty fast signals, treating them as
transmission lines is going to be important.
paul
