Max seep of the SD slot?
joerg at openmoko.org
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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