QSPI 32bit addressing mode

[Sumanth Murali]

We are using a flash part that is 64 MB in size. It is S25FS512. We are trying to use 32 bit addressing mode by setting sdk config flags. However this does not seem to work.
Has this been tested? Is there something else that needs to be done?

There is an API nrf_qspi_addrconfig_set which seems to be unused in the sdk. 

[Øyvind]

Hello, 

Can you please elaborate on what is not working? Are you getting any error messages? 

32bit addressing mode has been tested and working as far as I know with the MX25R6435F. Are you using the QSPI example as a starting point? Please make sure that the interface reflects your device. 

From the datasheet of your device it states:
The address transfers occur on SCK rising edge, in SDR commands, or on every SCK edge, in DDR commands.
Have you verified this is the case with your application?

Thanks! 

Kind regards,
Øyvind

[avaldes]

Any update on this? We are succesfully using 24bit mode but changing the SDK as show below 

#define NRFX_QSPI_CONFIG_ADDRMODE 1

#define QSPI_CONFIG_ADDRMODE 1

Did not seem to make it work. Is there anything that needs to be done beyond this configuration settings in the SDK for 32bit mode to work?

[Øyvind]

Hello, 

No, updates I'm afraid. I have forwarded this to our SDK team to assist with this issue. I will get back to you ASAP. 

Kind regards,
Øyvind

[Sumanth Murali]

Any update on this??

[Øyvind]

My sincere apologies, Sumanth Murali,

I have not forgotten you, and am still working on a solution. 

-Øyvind

[Øyvind]

Sumanth Murali, I have finally got an answer. 

The SDK configuration for 32-bit addressing modem only changes the addressing mode in our peripheral.

"The external Flash also needs to be told what mode it is expected to work in. This command can be different for different Flash vendors, hence difficult to include in the driver. To do that for this specific Flash part, you need to issue the 4BAM command (section 9.3.12 of the flash datasheet) using a custom instruction (described in the QSPI section of the nRF52840 PS). When both the external Flash and the QSPI peripheral are in 4-byte addressing mode, our peripheral uses the commands from the table on page 72 of the Flash part's datasheet with a 4-byte address."

Hope this helps! Let me know how it works.

[Sumanth Murali]

Hello Øyvind, Thanks for the response. We have tried doing this, but it does not really help. Either flash erase fails, or the address space wraps around at 24 bit max.