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Visitor
Visitor
1,735 Views
Registered: ‎01-27-2018

Managing supply voltage of SAKURA_G

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I am working on a project using SAKURA_G board. I am wondering is it possible to separate the VCCINT to different groups to provide voltages for different portions of the FPGA? Or is it possible to let the Spartan 6 FPGA of SAKURA_G board to work under multiple supply voltages?

 

Thank you very much! 

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Mentor
Mentor
1,625 Views
Registered: ‎02-24-2014

It's very straightforward..   The board is designed with a variable resistor (VR1) that lets you change the Vccint voltage on the Spartan-6 FPGA.   I recommend that you try 1.1 V,  1.15V,  1.2V, and 1.25V.    These voltages will be safe, and won't damage the FPGA.   I have heard rumors about certain Chinese equipment makers that run the Spartan6 devices at 1.3V in order to get higher performance from the PLL,  so even 1.3V is likely to be ok.

 

good luck with your experiments!

 

 

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Mentor
Mentor
1,720 Views
Registered: ‎02-24-2014

Sorry,  Vccint cannot be split.    It's a single physical power plane inside the package.   The voltage should always be 1.2V for Spartan-6.   If you need to conserve power, there are various tricks, but typically, the best way to save power is to avoid the use of PLL and DLL elements, and to reduce the clock as low frequency as practical.

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Visitor
Visitor
1,672 Views
Registered: ‎01-27-2018

Thanks for your reply. My goal is not powering saving. My project needs the FPGA to be working under multiple supply voltages.

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Xilinx Employee
Xilinx Employee
1,643 Views
Registered: ‎06-30-2010
its not clear what you are trying to do, can you elaborate? also i am not familiar with this SAKURA_G board have you talked with the makers of the board as well?
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Visitor
Visitor
1,633 Views
Registered: ‎01-27-2018

The SAKURA_G can be used to run experiment on AES. My goal is to let the AES crypto algorithm operate under 4 different values of supply voltage. I wanted to contact makers but I am not sure who should I talk to. Could you give me some direction?

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Mentor
Mentor
1,626 Views
Registered: ‎02-24-2014

It's very straightforward..   The board is designed with a variable resistor (VR1) that lets you change the Vccint voltage on the Spartan-6 FPGA.   I recommend that you try 1.1 V,  1.15V,  1.2V, and 1.25V.    These voltages will be safe, and won't damage the FPGA.   I have heard rumors about certain Chinese equipment makers that run the Spartan6 devices at 1.3V in order to get higher performance from the PLL,  so even 1.3V is likely to be ok.

 

good luck with your experiments!

 

 

Don't forget to close a thread when possible by accepting a post as a solution.

View solution in original post

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Visitor
Visitor
1,619 Views
Registered: ‎01-27-2018

I believe this can help a lot on my experiment. Although I wanted to apply different values of VCCINT simultaneously, it is good enough knowing this. Thanks a lot! 

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Visitor
Visitor
1,484 Views
Registered: ‎01-27-2018

Actually I have another problem. Do you know how can I adjust the voltage exactly at these voltage values? Thank you.

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Mentor
Mentor
1,464 Views
Registered: ‎02-24-2014

Hook up a digital voltmeter to the 1.2V Vccint supply on the board, and then adjust VR1 until you see the voltage you want.

Don't forget to close a thread when possible by accepting a post as a solution.
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Visitor
Visitor
1,457 Views
Registered: ‎01-27-2018

Thanks!

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