Hi!
I am using SPARTAN 2 XC2S150 for my design. I have a question regarding pull up resistors. I am using ISE5.1.
1)What is meant by optional pull ups? There are options in the Constraints Editor to insert pull ups at the I/Os. Are these PERMANENT pull ups or just during configuration? If I select these pull ups, then i also need to set M2M1M0=100 ?2)Alternatively if i DO NOT select those pull ups in the Constraints editor, but i still set M2M1M0=100 then what will happen? Pull ups will be used for configuration only?
3) Do i need to connect all my VCCO pins to 3.3V and VCCINT to 2.5V? All GND pins on the pacakge be grounded?4)If I use one clock signal in my design, then it can be input on only one IGCKO(input global clock buffer) or i need to connect all IGCK's to this clk signal?
Regards Rider