ADS131A02: Can I leave the Data Ready (DRDY) unconnected in Synchronous Slave Mode

Part Number:ADS131A02

I have only four SPI signals between CPU and ADS131A02 , and I want to use the ADC in  Synchronous Slave Mode.  should I  tied  DRDY directly to CS , just like the connections of  figure 62 in datasheet.  in this mode, Dose ADC work OK  if I  leave DRDY unconnected.