https://devzone.nordicsemi.com/f/nordic-q-a/88668/zephyr-qspi-activate-task---timeout-issueHi, Initialization returns with time out , I see some signals continuously from the CS CLK IO0 pins. This happens after triggering the &quot;activate task&quot; in nrfx_qspi_init function. nrf_qspi_task_trigger ( NRF_QSPI , NRF_QSPI_TASK_ACTIVATE ); en-USTelligent Community 13Tue, 07 Jun 2022 18:05:41 GMThttps://devzone.nordicsemi.com/thread/371234?ContentTypeID=1Tue, 07 Jun 2022 18:05:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bbaa6ff4-fe7f-4c24-98e4-48876621f7b0Kenneth<p>The instruction set supported are listed here:<br /><a href="https://infocenter.nordicsemi.com/topic/ps_nrf5340/qspi.html#instruction_set">https://infocenter.nordicsemi.com/topic/ps_nrf5340/qspi.html#instruction_set</a>&nbsp;</p> <p>The&nbsp;TASKS_ACTIVATE will execute the read status register instruction (RDSR, opcode 0x05). If you want to see how this opcode looks like I suggest to check out the Macronix datasheet for the serial NOR flash used on the nRF5340-DK:&nbsp;MX25R6435F</p> <p>See in specific Figure 10. Read Status Register (RDSR) Sequence (page 26) and&nbsp;Status Register table (page 30):<br /><a href="https://www.macronix.com/Lists/Datasheet/Attachments/8746/MX25R6435F,%20Wide%20Range,%2064Mb,%20v1.5.pdf">https://www.macronix.com/Lists/Datasheet/Attachments/8746/MX25R6435F,%20Wide%20Range,%2064Mb,%20v1.5.pdf</a>&nbsp;</p> <p>Only NOR flash is supported.</p> <p>Hope that helps,<br />Kenneth</p><div style="clear:both;"></div>