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[Moved]: Crystal Oscillator connection for PLL

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jstefanop

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I have a 32MHz crystal clock that I need to connect to PLL Clock input and loopback pins. Current design refrence has the oscillator connected to a Spartan 6 FPGA which then feeds the clock signal to the ASIC chips and is wired like so:
22014426482_547c2a83f9_c.jpg


In my design I need a direct connection from the oscillator to the ASIC pins so have it hooked up like so:
22057980241_a482f9080a_o.png

Most designs have pin 4 to ground for this clock....so why does the reference design have it hooked up to VCC?
 

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