What are the VREF and VCCO pins on Xilinx Spartan FPGA?

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farshadr

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please explain to me what is the VREF and VCCO pins on xilinx spartan fpga?
how work them?
 

Re: Vref and Vcco pins ?

You ask that, and you want to make your own fpga board on a 2 layer pcb? Are you really really really sure you are not better of putting some time/money/energy into buying a fpga board, and getting it shipped to your country?
 

thank you for your advice , but please reply my technical question.
mrflibble if i have other choice , be sure i choose it
Better to ask the way than go astray
 

VCCO would be the I/O voltage for the I/O banks of the fpga. VREF is also used for I/O.

For detailed information you'll have to check the xilinx datasheets for the particular spartan you want to base your board on.
 
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