A disclosed example includes setting a first reference voltage value in a memory device for use during operation of the memory device in a per-device addressability (PDA) mode, the first reference voltage value for use by the memory device to determine a first logic value at a data line of the memory device during the PDA mode, the PDA mode to enable access to the memory device exclusive of other memory devices in circuit with the memory device; and setting a second reference voltage value in the memory device for use during operation of the memory device in a non-PDA mode, the non-PDA mode to enable writing data to the memory device, the second reference voltage value for use by the memory device to determine a second logic value at the data line of the memory device during a write operation.