Meaning of NET "anodes<0>" LOC="P18";

[stonechild]

In Chapter 14 of Mike Field"s  "Introducing the Spartan 3E FPGA and

VHDL" 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.

[johnbeetem]

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>".

[stonechild]

John,

 

Thanks or your reply. Your answer helped me to get going with that chapter.

 

Dennis.