On Tue, 17 Jul 2007 09:11:15 -0700
David Brownell <[EMAIL PROTECTED]> wrote:
>
> Curious. I think it was Jan Nikitenko who reported mode 0 not
> working for SD, while mode 3 did work. All my recent testing
> used mode 3, but I started with mode 0...
>
> Ideally, someone with access to full MMC and SD specs can see
> what they say about the SPI clocking. The simplified SD specs
> omit the timing diagrams.
>
I can probably help out there.
According to the specs, both mode 0 and mode 3 are valid. The idle
polarity simply isn't specified, only that data shall be sampled on
rising edge. Hence mode 0 or 3.
Rgds
--
-- Pierre Ossman
Linux kernel, MMC maintainer http://www.kernel.org
PulseAudio, core developer http://pulseaudio.org
rdesktop, core developer http://www.rdesktop.org
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