Fan stopped on FPGA

[Altera_Forum]

Hi,  

 :confused: I have downloaded a programming file into my DSP Stratix EP2S180 and the fan above the stratix stopped.  Any idea ?  thanks

[Altera_Forum]

You are probably over-drawing the power supply. Double check that unused pins are set to tristate, not GND. There is an assignment in the GUI, or you can steal it from the QSF file for an existing project. Double check that you aren't in IO contention with an external device.  

 I do that all the time.

[Altera_Forum]

keep us posted on this one.

[Altera_Forum]

Read manual properly. 

You have to assign all unused pins to "Tri-stated inputs" in Device and pin assignments.  You might have forgot that.

[Altera_Forum]

How do I do this in quartus II? 

 Thank you

[Altera_Forum]

For Quartus II v8.0 do the following. 

Go to Assignment->Device Click 'Device and Pin' Option Button in the dialog box. Click 'Unused Pin' tab in the dialog box. Set 'Reserve All unused pins' to 'As Input Tri stated' if not already so. Click OK twice. Its done !! Now if you compile fully and load the .sof into kit, the fan will keep running.....

[Altera_Forum]

I don't know if there are issues related to what I did, but since I can program the device from distance (another machine with JTAG Server), I have hardwired the fan wires to GND and VCC. 

 The black wire is now connected to the nearest GND pin on the Dev Board, and the red wire is connected to the nearest 5V pin on the Dev Board.  So, it doesn't matter, what I program to the Stratix II component, the fan will never stop.  Gabriel,  PS: I really don't know if there are related issues with this procedure, but I'm using it since 2007.