to generate steps in phase

[Max]

I must generate 4 able steps to command some Dff.In this way:

PCk0<=CLK0_S and CLK270_S;
PCk90<=CLK90_S and CLK0_S;
PCk180<=CLK90_S and CLK180_S;
PCk270<=CLK180_S and CLK270_S;

I use a DLL.
how I can obtain marks them clean and in phase?