As tittle, would you kind to clarify that SPI with Non-Connection on circuit if only parallel mode used for HMC795LP5E ? Besides, which condition of correction mode be needed ? Thanks.
If the SPI lines are not used, then either ground or pull down through a resistor such as 10k ohms. For Correction Mode, you will need the SPI control; see page 18 of the datasheet for details.
Retrieving data ...