Hi Shubham,
Unfortunately we do not have example code using the TIVA processor at this time. You should be able to find example code for the TIVA processor elsewhere on TI.COM.
For the ADS1218 you will need to hold CS low throughout the entire communication transaction, so if you are using CS you will need to use a GPIO pin to control CS and not the SS pin for the TIVA SPI. The clock polarity and phase will depend on the POL pin setting of the ADS1218.
If you have a more specific question, I can try to answer.
Best regards,
Bob B