terryphi Posted November 18, 2015 Report Share Posted November 18, 2015 Hello, I have a Papilio One 500k, and I see on the chip, it is marked with a 4C speed grade. Now, does this correspond with the speed setting in the xilinx ise? What happens if I choose -5 instead of -4? Also, what does the 'C' refer to? I don't see any 'C' in the new project wizard's settings. Quote Link to comment Share on other sites More sharing options...
alvieboy Posted November 18, 2015 Report Share Posted November 18, 2015 Now, does this correspond with the speed setting in the xilinx ise? Indeed. You should select -4 speed grade. What happens if I choose -5 instead of -4 ? Your timing analysis will be wrong. -5 devices are more performative than -4. That means that if you are close to the timing limits on -5, it will never run on a -4.If it was the opposite (running a -4 on a -5 device) you'd be fine, but your design could eventually become faster if you chose the correct timings. Also, what does the 'C' refer to? I don't see any 'C' in the new project wizard's settings. "C" refers to temperature range, as in "Commercial" (as opposed to "I", which means "Industrial"). See page 7 of DS312 - Spartan-3E FPGA Family: Complete Data Sheet Alvie Quote Link to comment Share on other sites More sharing options...
terryphi Posted November 18, 2015 Author Report Share Posted November 18, 2015 Great! Thank you for your concise and informative answer! Quote Link to comment Share on other sites More sharing options...
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