Controlling Initial States in ABEL

Use the INIT attribute to control the initial value of macrocell registers during device power up. Use INIT=S to Set on power-up; use INIT=R to Reset on power-up. (Reset is the default.) You can assign the INIT attribute to registered nodes or output pins in your design.

For example:

q1 pin istype’reg’;
xilinx property ‘init=s q1’;