stonechild Posted October 5, 2014 Report Share Posted October 5, 2014 In Chapter 14 of Mike Field"s "Introducing the Spartan 3E FPGA andVHDL" the notation NET "anodes<0>" LOC="P18"; is used in the constraint file I don't understand what this way of expressing a constraint means as opposed to NET switches(7) LOC = "P91" | IOSTANDARD=LVTTL; I've looked around and can't figure out what the "<>" indicate. Quote Link to comment Share on other sites More sharing options...
johnbeetem Posted October 6, 2014 Report Share Posted October 6, 2014 In most versions of Xilinx ISE I've used, the notation "A<i>" in a User Constraint File means "bit i of bus A". I think I've also used "A" in some versions, but in recent years I've always used "A<i>". Quote Link to comment Share on other sites More sharing options...
stonechild Posted October 11, 2014 Author Report Share Posted October 11, 2014 John, Thanks or your reply. Your answer helped me to get going with that chapter. Dennis. 1 Quote Link to comment Share on other sites More sharing options...
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