MMC modes

From: tehn yit chin (tehnyitchin_at_hotmail.com)
Date: 01/06/05 

Date: 5 Jan 2005 20:21:45 -0800

Hi all,

I hope someone can help me out with a simple question about
interfacing to an MMC/SD card.

I wish to talk to card via MMC mode. Does that mean that pin 1 of the
MMC card should be driven with a logic high signal, or should be it be
left floating?

I understand that by driving a logic low signal onto pin 1 of the MMC
card will select it and put it into SPI mode.

Can anyone confirm that?

thanks,

Relevant Pages

  • [RFC] 1/4 MMC layer
    ... This patch adds core support to the Linux kernel for driving MMC ... * Ensure that no card is selected. ... +static struct mmc_card * ... +static int mmc_major; ...
    (Linux-Kernel)
  • Re: [patch 0/5] Add MMC password protection (lock/unlock) support
    ... These series of patches add support for MultiMediaCard (MMC) password ... a MMC card with no password assigned is always in "unlocked" state. ... Only after unlocking it with the correct password the ... a new sysfs attribute was added to the MMC driver. ...
    (Linux-Kernel)
  • [patch 0/5] [RFC] Add MMC password protection (lock/unlock) support
    ... These series of patches add support for MultiMediaCard (MMC) password ... a MMC card with no password assigned is always in "unlocked" state. ... Only after unlocking it with the correct password the ... a new sysfs attribute was added to the MMC driver. ...
    (Linux-Kernel)
  • Re: Block request processing for MMC/SD over SPI bus
    ... MMC/SD card slots hooked up to SPI controllers, ... This version gets part way through MMC and SD card enumeration, ... +static int mmc_spi_delayed ...
    (Linux-Kernel)
  • [PATCH 2.6.16] mmc: Read and parse mmc v4 ext_csd structure
    ... I've recently being investigating adding support for the mmc v4 high speed ... and wide bus features, based on some documents I found online (A couple of ... about equivalent to an SD card on the same hardware. ... turning that into a real mergable patch requires a lot more work; ...
    (Linux-Kernel)