Minor update...
+tnadovich

 I changed the pinout of the DDS Connector to the following

1   SDIO
2   NC
3   SDO
4   NC
5   SCLK
6   NC
7   CS#
8   GND
9   IO_UPDATE
10  GND
11  IO_RESET
12  GND
13  PWR_EN
14  GND
15  5V
16  GND
17  5V
18  GND
19  5V
20  GND

The reason for this update is to prevent shorts in the case where the
connector is plugged in the wrong way. This seems reasonable, since it
will not result in anything bad happening and combined with keying
will definitely prevent shorts.