William25 Posted January 6, 2016 Report Share Posted January 6, 2016 Im using the Papilio Duo and pin 27(D27) is putting out 2.5v insted of 3.3vany ideas why? in the code it gives out '1' so it should put out 3.3v.Thank you! Quote Link to comment Share on other sites More sharing options...
Felix Posted January 7, 2016 Report Share Posted January 7, 2016 can you try checking the voltages on the headers? Quote Link to comment Share on other sites More sharing options...
mkarlsson Posted January 7, 2016 Report Share Posted January 7, 2016 Im using the Papilio Duo and pin 27(D27) is putting out 2.5v insted of 3.3vany ideas why? in the code it gives out '1' so it should put out 3.3v.Thank you! You can't expect to see 3.3v on the output pin. What IO standard are you using? LVTTL? LVCMOS33? The Spartan-6 data sheet specifies that for LVTTL the Voh (V output high) is minimum 2.4V and for LVCMOS33 Voh is minimum Vcco - 0.4V (i.e. min 2.9V). So if you are using LVTTL then 2.5V is well within spec. For more info see Table 9 on page 10 in this data sheet: http://www.xilinx.com/support/documentation/data_sheets/ds162.pdf Magnus Quote Link to comment Share on other sites More sharing options...
alvieboy Posted January 8, 2016 Report Share Posted January 8, 2016 Unless there's a load on the pin it should indeed be around 3.3V.Did you have anything connected to that pin ? Did you have any wing connected to it ? Alvie Quote Link to comment Share on other sites More sharing options...
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