Description
You may observe register bits related to the volatile key sometimes being set after power-up when executing the KEY_VERIFY JTAG instruction, even though no key is programmed in Stratix® V, Arria® V or Cyclone® V devices. This is because there is no power-up reset for the registers that are powered by VCCBAT, so these bits are undefined at power-up.
This will not cause an issue with programming the key.