P9 Expansion Header question


at http://elinux.org/Beagleboard:Cape_Expansion_Headers#Full_Headers_with_8_Modes the pinout of expansion headers is shown. For every pin there is exactly one row describing the functionality of the related pin according to a chosen mode.

But pins 41 and 42 of header P9 are different, they are named “41#” and “42@” and contain two rows describing possible functionalities and two GPIOs each. So…what does this mean? How can one choose a specific functionality of these pins? Setting the pin-mux-mode doesn’t seem to do the trick since it can be used with the standard modes only and here twice as much are listed.


This means that there are TWO processor pins connected to one connector pin. Refer to the schematic and the Systems reference Manual for deatials.