spdif pinout or layout of the xplosion ?

i d like to connect the xplsoion card to the vga card though an spdif audio cable. the conectic existe on the vga card gts 250 but it is not obvious on the xplison audi card. there is a spdifo but there is 6 pins where as the cable provided by evga has 2 fema;e connectors. amongt those 6 (actually 4 because 2 are blank) , ehich ones are the spdifo and the ground ?

any idea would be gratly appeciated