Max seep of the SD slot?

Joerg Reisenweber joerg at
Sat Jul 26 04:06:05 CEST 2008

Am Fr  25. Juli 2008 schrieb BlueStar88:
> What about fixing the rate on the sd-card side to far lower level, not 
> only while ideling, even if accessing? Lets say 5MHz. Would it make any 
> sense and would it decrase the clock noise significally enough, to be 
> able to just ignore the hardware patch?

To add to Andy's prev comment, the noise isn't exactly relating to 
clock-*speed* but rather to signal rise- and fall-time of the low-high-low 
transitions. Those aren't affected by mere closck-speed, but actually are by 
adding caps or changing drive-power.
Think of it like hitting a bell once a second or every 3 seconds doesn't 
change the frequency or amplitude of the bell's tone itself.
Anyway fiddling with sd-clock-freq won't hurt, just report your results. Maybe 
we find something unexpected ;-)

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