Hi

i have problem that it's seem like power.

When i working fx2lp board and fpga board.

So i connect with both board  for slave fifo working.

Fx2lp board is just connected USB cable( it's just use power from usb cable).

When i connect FPGA Board to Fx2lp board, FPGA Board's led is weak on.

it's seem like something wrong. but slave fifo is working well(stream project ).

I dont know what am i check ?

 Addingly above post,

 if i use 16bit slavefifo mode, which pin used for i2c in fx2lp-56pin?

how can i handle of this problem?

 Do you mean to say, FX2LP is back-powering FPGA board even when FPGA is not supplied with any voltage?

Thanks

Nikhil

 Hi,

Please find the attached is Spartan3E FPGA-FX2LP interface board schematic.

-PRJI