https://devzone.nordicsemi.com/f/nordic-q-a/47129/implementing-comunication-between-a-nrf52840-and-a-qspi-memory-is37sml01g1-from-issiHello. We are developing a device that require a 1Gb qspi memory interafaced with a nrf52840. So far the qspi driver and the memory inits and the memory respond to some commands, but fail in anothers. Taking a look to the instruction data set foren-USTelligent Community 13Tue, 14 May 2019 20:52:22 GMThttps://devzone.nordicsemi.com/thread/187086?ContentTypeID=1Tue, 14 May 2019 20:52:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6dba8613-37df-4e93-b995-97e1504dc330EdenCandelas<p>Understood, thanks for your answer, I wiil look into that other memory option.</p> <p></p> <p></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/186883?ContentTypeID=1Tue, 14 May 2019 09:10:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a8f3d0cf-0587-49d6-ad05-f98d56bea3fdJared<p>Hi Eden,</p> <p>Sorry for the late reply,</p> <ol> <li>This is a hardware limitation. The only option would be to use the <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52840%2Fqspi.html&amp;cp=3_0_0_5_18_5&amp;anchor=custom_instructions">custom command option</a>. This is not recommended for read/write transaction because it will be very slow.&nbsp;</li> <li>I would much rather recommend that you find a memory with the same opcodes. <a href="https://www.digikey.no/products/en/integrated-circuits-ics/memory/774?k=&amp;pkeyword=Macronix&amp;sv=0&amp;pv142=1572&amp;sf=0&amp;FV=8e80066%2c1fec000d%2c1fec000e%2cffe00306&amp;quantity=&amp;ColumnSort=0&amp;page=1&amp;pageSize=25">Here </a>is an external flash that has the same opcodes but is 2 Gb.&nbsp;</li> </ol> <p>Best regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>