On Fri, Jul 29, 2011 at 7:54 AM, Max Scane <mjs...@gmail.com> wrote:
Hello David,I think that is intentional to make the signal TTL compatible??On Thu, Jul 28, 2011 at 10:32 PM, vk5dg <vk...@aapt.net.au> wrote:Hello All,
I've just started playing around with the SD card and found a
potentially nasty problem with the interface (pun
intended).
The Data Out line from the SD card is pulled up to 5v via PU4.7k-H to
pin 9 of U4C.
According to the specs and the original SBC interface it should be
only 3.3v.
I have put my card in and powered up a few times before noticing this
fault. So far it has survived.
The cure is to cut the track to PU4k7-H. There is already a 10k
pullup to 3.3v in RR3.
Now back to getting the driver working.
Regards
David
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