Re: MMC 4 bit, 8 bit mode and MMC high speed support in sdbus2.dll

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If you take a look in the source code of sdbus2 driver it will tell you that
it will be hardcoded to 1 bit:
<WINCEROOT>\PUBLIC\COMMON\OAK\DRIVERS\SDCARD\SDBUS

one example is in sddevice.cpp where it is saying:
// MMC cards are always 1 bit, set the clock rate to the default MMC rate


Erwin Zwart

"Hector Bujanda" <hector_bujanda@xxxxxxxx> wrote in message
news:ujdk$MlxIHA.4876@xxxxxxxxxxxxxxxxxxxxxxx
I can confirm that my 8bit HS MMC cards are told to use only 1 bit with
both sdbus.dll and sdbus2.dll

Can MS confirm that 4/8 bit MMC cards are currently not supported???

Thanks in advance.

Héctor Bujanda. Digi International Inc.

"ce_user" <hzpeterchen@xxxxxxx> wrote in message
news:95922065-af1f-4580-9177-804200f32362@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On May 27, 7:47 pm, Talib <Ta...@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Hi,

sdbus2.dll has been supplied to support high capacity and high speed
cards
in wince6.0. Does it actually supporting the HC and HS features. has
anybody
tested those features. In my case I tested SDMemory High speed card but
the
card is not coming to high speed. it was running on normal speed.

Does sdbuss2.dll also support 4bit and 8 bit mode for MMC? I saw the code
it
is doing nothing means not switching the bit mode for MMC case.

Can anybody comments on this?

Thanks
Talib


Windows CE6(R2 added) support HC and HS for SD card, but HS can't work
through my test.
you need to add switch function before set four bit mode( just like
ce5 do).
For MMC, only support MMC4.0-, that means you can 1 bit mode, and
24Mhz( or lower, I am not very sure)

Chen Ning
SiRF Technology



.

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