The SO-DIMM connector is on the upper face of the board, facing away from the motherboard, and drives 1GB of 64-bit DDR2 memory. You can download the signal list and connector information from the JEDEC web site. See Other publications.
ARM recommends that you use the SO-DIMM memory supplied with the CoreTile Express A5x2 daughterboard. ARM does not recommend using alternative DIMMs.