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  • Case ID: 336538
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nRF5340 QSPI compatible RAM chip

Michal Mrowiec

Hello, we have a following issue: we would like to use nRF5340 QSPI driver with external RAM to store measurements data. Power supply for PCB is 1,8V, so we tried to use APS6404L-SQRH. Unfortunately, APS does not provide a h05 command to read memory status and nRF QSPI hardware driver need it for communication. What are nRF5340 compatible RAM chips, which you are sure, will be working? Please, could you specify example part numbers or families? Thank you in advance!

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    The QSPI peripherial cannot be used as RAM, it can only be used as ROM in XIP mode.

    Read the PS, this peripherial is tailored for NOR flash usage and (almost) nothing else.

    Use NRF54H series if you needed more RAM.

    You could try using the QSPI "custom instruction" registers for writing, but this would very likely need custom code instead of using the shipped drivers. Note that I did not bother reading datasheets to be able to tell if thats even possible - that would trigger my hourly rates.

    If the chip supported regular 1-bit SPI mode - just use a normal SPIM to read/write data manually.

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    The QSPI peripherial cannot be used as RAM, it can only be used as ROM in XIP mode.

    Read the PS, this peripherial is tailored for NOR flash usage and (almost) nothing else.

    Use NRF54H series if you needed more RAM.

    You could try using the QSPI "custom instruction" registers for writing, but this would very likely need custom code instead of using the shipped drivers. Note that I did not bother reading datasheets to be able to tell if thats even possible - that would trigger my hourly rates.

    If the chip supported regular 1-bit SPI mode - just use a normal SPIM to read/write data manually.

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