The FDO Provider for ArcSDE is based on a subset of the ArcSDE API. **This subset does not include the following:**

    Raster functionality
    Native ArcSDE metadata
    The annotation data, with the exception of the ANNO_TEXT column

http://wikihelp.autodesk.com/AutoCAD_Map_3D/enu/2013/Help/0005-FDO_Deve0/0104-OSGeo_FD104/0109-FDO_Prov109

use WMS service as Brad Nesom mentions