Hi i want handle PORTA of fx2lp-56pin in slave fifo mode. 

More detail, i want make what PORTA.0 is output and PORTA.1 is input. 

But i don't know how am i supposed to make configuration in F/W. 

Also, could you please let me know what is different between OEA and IOA?

 dv2

IOA and OEA are clearly explained in FX2LP TRM.

This information is present in the TRM in page173:

The EZ-USB has up to five 8 bit wide, bidirectional I/O ports.

Each port is associated with a pair of registers.

■ An ‘OEx’ register. It sets the input/output direction of

each of the 8 port pins (0 = input, 1 = output).

■ An ‘IOx’ register. Values written to IOx appear on the

pins configured as outputs; values read from IOx indicate

the states of the 8 pins, regardless of input/output

configuration.

 In your case:

By default all port pins are in input state, so to chnage PA.0 to output, use

OEA|=0x01

The value you write to IOA will appear on output pin, for example to output 1 on PA.0, use

IOA|=0x01