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→Reliability
** VIN: this is main power supply input. See [[#Pinout|Pinout]] section for more information about voltage range.
** VIN_AUX (available on request): this input is provided to implement a second power supply unit on carrier board (for example based on supercap or battery) that prevents power cut in case main supply experiences a glitch or a power cut. This option is a powerful weapon to face unpredictable power loss and to guarantee data integrity.
** Overcurrent/thermal warning indicator.
* NAND flash: by default NAND technology is SLC. MLC memories are available on request.
* read-only modes: two signals are provided in order to inhibit any write operation on NAND flash. See [[#Read-only modes|Read-only modes]] and [[#Pinout|Pinout]] section for more details.
* NAND controller: the controller implements specific algorithms designed
** to prevent data corruption in case of power failure
** to recover from unexpected power-off.
[[File:Dul-ruler.png|thumbnail|center|]]
===Read-only modes===