The nominal value of MVref is 1.5V. 1%, +/- 7.5mV is the tolerance value for MVref (ripple range).
RDRVR is the "Driver" resistance. It is the resistance at the driver side. Half strength is ~40 ohms and full strength is ~20 ohms.
The MDIC resistors connected to MDIC [0:1] signals used for either full or half drive strength calibration do not draw much current. So you can use 1/16W rated resistors for either half or full drive calibration.