https://devzone.nordicsemi.com/f/nordic-q-a/36128/reading-from-flash---when-via-icode-dcodeGreetings, in the system I develop I shall have a task resposible for fetching some amount of data from Flash to RAM. I should mention that the code will be executed from Flash with the instruction cache (I-Cache) enabled. As far I understand (afteren-USTelligent Community 13Fri, 06 Jul 2018 14:07:43 GMThttps://devzone.nordicsemi.com/thread/139281?ContentTypeID=1Fri, 06 Jul 2018 14:07:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6cb6e8fc-0893-411f-85eb-8c10a2343325Borys Jeleński<p>Thank you very much for the comprehensive answer,</p> <p>Best regard,</p> <p>Borys</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/139231?ContentTypeID=1Fri, 06 Jul 2018 10:46:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d687d83f-9d89-4ac6-abb8-bfd1405bfa3dbjorn-spockeli<p>HI Borys,&nbsp;</p> <p>The I-CODE bus is used to fetch instructions(either from the I-Cache or directly from the code memory region) and the D-CODE bus is used for data access in the code memory region, see&nbsp;<a title="Bus interfaces" href="http://infocenter.arm.com/help/topic/com.arm.doc.ddi0439b/CACDHCFH.html">Bus interfaces</a>&nbsp;in the&nbsp;<a title="Cortex-M4 Technical Reference Manual" href="http://infocenter.arm.com/help/topic/com.arm.doc.ddi0439b/index.html">Cortex-M4 Technical Reference Manual</a>. Hence, its the I-CODE bus will fetch the instruction regardless if there is a cache-hit or cache-miss. The links below are for the ARM Core</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>