Xilinx Property REG

Use REG=CE to selectively force the useage of the CE pin on FDCE or FDPE flop instances. Use the following syntax:

xilinx property ‘REG=CE reg_list’;

For example, to selectively force the CE usage on q0 and q1, use the following:

xilinx property ‘REG=CE q0 q1’;
 

Use REG=TFF to indicate that the register is to be implemented with a T-type-flip-flop. A REG=TFF property on a D-type-flip-flip will cause the D-input expression to be converted to a T-input expression. Use the following syntax:

xilinx property 'REG=TFF reg_list';

For example, to indicate that q0 and q1 are to be implemented with a T-type-flip-flop, use the following:

xilinx property 'REG=TFF q0 q1';