>size : the actual size of the buffer </td></tr>
    <tr><td class="paramname">uint16</td><td>length : the total size of the buffer </td></tr>
    <tr><td class="paramname">uint32*</td><td>buf_ptr : the start address of the buffer </td></tr>
    <tr><td class="paramname">struct</td><td>sdio_queue* nxt_ptr : the address of the next descriptor </td></tr>
    <tr><td class="paramname">struct</td><td>sdio_queue* i2s_queue : the address of the current descriptor</td></tr>
  </table>
  </dd>
</dl>
<dl class="sect