📄 emsdio_sdsdio_overview.htm

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     <font color="#FFFFFF" size="5" face="Arial, Helvetica, sans-serif"><strong>Embedded SDIO Driver Kit Help </strong></font></td>
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<p class="BODYTEXT">The proliferation of feature-rich mobile devices, with ever-increasing
  processing capabilities has created a desire for expansion options previously
  seen only in the laptop/desktop space. Consumers are increasingly demanding
  expansion options to increase capacity (storage) or capabilities (features)
  in order to fend off, for the moment, the threat of obsolescence and future
  (largely unknown) needs. </p>
<p class="BODYTEXT">As mobile devices become increasingly more powerful
    the line between a single function consumer electronic device and a more
  general computing device becomes blurred. One indication of this trend has
  been in
    the standardization of I/O expansion in mobile devices.
  
Previously I/O expansion in mobile devices consisted of proprietary hardware/software
    interfaces, typically only available to the specific manufacturer and in
  many cases to a specific device model. Soon afterwards a generation of devices
  adapted
    technology from the realm of laptop computing in the form of CompactFlash
  I/O. CompactFlash I/O expansion offered a relatively painless way to incorporate
    PCMCIA standards to a more mobile-friendly form factor. </p>
<p class="BODYTEXT">Demand for thinner
      and lighter devices has pushed the need for even smaller I/O expansion
  technologies.
Secure Digital Memory standards addressed the need for a high density, small
form-factor  and low power memory card. Secure Digital I/O (SDIO), introduced
  in the later part of 2001,
  is an
  evolutionary
  offshoot
  of
  Secure
  Digital Memory
  technology.
  SDIO
  is based
    on
      similar electronics and mechanicals borrowed from the original SD memory
    card specification, and offers device manufacturers a convenient way to support
      memory and I/O cards in the same slot. SDIO extends the specification to
    meet
      I/O specific requirements in terms of power, plug and play, and I/O commands
      and signals.  The addition of I/O expansion capability to an SD memory
      slot can be implemented at minimal incremental cost, largely due to the
      availability of more capable controllers.  
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