Author Topic: Spartan6 Extended Performance  (Read 514 times)

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Offline hal9001

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Spartan6 Extended Performance
« on: October 26, 2021, 12:29:58 pm »
The Spartan6 data sheet calls out a different Vccint voltage for standard v extended performance. What does the extra .03 V do to give the FPGA higher performance for a -3 or -2 part?



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Offline dtodorov

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Re: Spartan6 Extended Performance
« Reply #1 on: October 26, 2021, 12:54:45 pm »
The specs seem generally tighter for -3/-2. For what I can think of, digital timings deteriorate with reduced supply voltage :-//

Very likely the devices are binned and their specs can be guaranteed with a narrower margin.
 
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Offline BrianHG

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Re: Spartan6 Extended Performance
« Reply #2 on: October 26, 2021, 12:59:51 pm »
The Spartan6 data sheet calls out a different Vccint voltage for standard v extended performance. What does the extra .03 V do to give the FPGA higher performance for a -3 or -2 part?



Cheers!
You are reading the table wrong.  The margin is larger than that.  You must only consider the -min column when you want to guarantee reported FMAX performance.  There you see the spread is from 1.14 to 1.20.  That's a 0.06v difference, almost 0.1v.
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Offline Someone

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Re: Spartan6 Extended Performance
« Reply #3 on: October 26, 2021, 10:07:59 pm »
Some (older) FPGA families had timing characterised across supply voltage and/or temperature. If you could guarantee the devices were running in "better" conditions, you provided your specific conditions to the timing tools and the timing was uprated (and still guaranteed by the vendor).
 
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Offline hal9001

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Re: Spartan6 Extended Performance
« Reply #4 on: October 27, 2021, 11:20:31 am »
Thanks all. Even with .06 V difference the regulator for Vccint needs to have very low ripple to hold the extended performance!
Is there a significant power draw difference on Vccint when running in standard v extended voltage?
 

Offline dtodorov

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Re: Spartan6 Extended Performance
« Reply #5 on: October 27, 2021, 11:27:54 am »
Is there a significant power draw difference on Vccint when running in standard v extended voltage?

This should be also described in the datasheet.
 
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Online NorthGuy

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Re: Spartan6 Extended Performance
« Reply #6 on: October 27, 2021, 02:53:27 pm »
Is there a significant power draw difference on Vccint when running in standard v extended voltage?

No doubts. Power draw is mostly the switching losses of the FETs.

Gamesters do overclocking and overvoltaging on their PCs all the time.
 


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