Keywords, Arch Wizard, DCM, PLL, Virtex-5, V5, Differential Clk Input
Currently, the Architecture Wizard does not allow the use of differential clock inputs when creating a clocking scheme of DCM to PLL. This is because the Architecture Wizard does not allow the user to select IBUFGDS as an input buffer.
This issue will be addressed in a future software release. Until this issue has been resolved, the user will need to generate a system using an IBUFG. After the system has been generated, the code must be modified to support the IBUFGDS.