The behavior of Flash If the DNU and RFU pins are short-circuited with the adjacent pins

[NoAr_1540581]

Hi, If the DNU and RFU pins are short-circuited with the adjacent pins, please tell me the behavior of S25FL512SDSMFM010 that can be assumed.

[Anonymous]

Hi,

DNU pin may be internally connected to the die. It might be used for test mode entry and hence, these pins have to be left unconnected/floating. For RFU pin, no internal signal is currently connected to the die but there is potential future use of the connector for a signal hence we recommended this pin to be left unconnected/floating.

Thanks,

Nada

[NoAr_1540581]

Hello

In the unlikely event that DNU/RFU becomes Hi or Low due to contact with the neighboring pin, etc. As a behavior of Flash, we have received inquiries about what kind of things can be assumed
Is it possible to answer the situation in such a case?

ex1. DNU -> Hi or Low

ex2. RFU -> Hi or Low

Best Regards

Arai

[SudheeshK · Accepted solution]

Hi Arai-san,

As Nada-san already mentioned, RFU pins are not connected internally to the die. So, it is OK to make RFU pins either HIGH or LOW. DNU pins are connected internally. But, any DNU related functions will be inactive if the signal level is at VIL (Refer Table 2. Signal List in datasheet), also there is an internal pull down resistor on DNU pins. So, there will not be any problem if you make DNU pins LOW.

If you make any of the DNU pins HIGH, then the device may not function properly.

Thanks and Regards,

Sudheesh