The power problem between fx2lp board and fpga board.

[Anonymous]

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 ?

[Anonymous]

 Addingly above post,

       

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

   

how can i handle of this problem?

[Anonymous]

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

       

Thanks

   

Nikhil

[Anonymous]

 Hi,

   

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

   

-PRJI