SN65DPHY440SS: RSTN and VREG_OUT are unexpected low

Hi,

Is there any reason that RSTN and VREG_OUT are still 0V after 1.8V is applied at Vcc with below design?  

• RSTN is only connected to GND through a 0.22uF cap.
• VREG_OUT has two 0.1uF cap and being connected to VDD pin with two 0.1uF cap.

What can be checked further to clarify this?

Thanks!

Antony