The TEMP_BUS port has been disabled for few particular invalid combinations from the 2014.3 release.
In 2014.4, the Enablement and Disablement for the TEMP_BUS Port has been reviewed, and it now cannot be true in the following three conditions:
a) When using "Independence ADC" as the Startup channel Selection.
b) When using "Channel Sequencer" as the Startup channel and If the Sequencer Mode is One_Pass.
c) If the Acquisition Time is 10.
If designs containing any of the above situations are migrated, the TEMP_BUS will be removed and a warning will be displayed.
When using the XADC in Independence ADC Mode, ADC will monitor all of the internal sensor channels including the Temperature sensor (users can select the only Vp_VN and all of the VAUX channels to monitor on ADC B).
Therefore if you need access to the Temperature information, you can read from the Temperature Status registers via the AXI or DRP interface.