I am interfaced an image sensor to fx3 in 16 bit mode...
i am using only 10 bit data pins of fx3,remaining 6 bit data pins are unconnected
can i use these 6 bit data pins as normal GPIO by calling gpiooverride API?
No, it is not possible. Those 16 lines will be a part of the GPIF Bus. If you want only 10 bits of data, the only way to do so is to extract the data in the host application on the PC.