https://devzone.nordicsemi.com/f/nordic-q-a/75151/nrf5340-two-m33-exchange-data-problemhi， iI&#39;m newer useing nRF5340， nRF5340 two cores communicate via IPC ,then exchange data through which path that is IPC or CTM ，What&#39;s the difference between IPC and CTM？en-USTelligent Community 13Fri, 14 May 2021 08:54:41 GMThttps://devzone.nordicsemi.com/thread/309721?ContentTypeID=1Fri, 14 May 2021 08:54:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7e0f20da-fd21-44ed-a29b-9af16e64c7f6Einar Thorsrud<p>Hi,</p> <p>Cross Trigger Matrix (CTM) is part of the <a href="https://infocenter.nordicsemi.com/topic/ps_nrf5340/cti.html?cp=3_0_0_7_10">Cross Trigger Interface (CTI)</a>&nbsp;which are concepts related to multicore debugging (see <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf5340%2Fdebugandtrace.html&amp;anchor=crosstrigger">Cross-trigger network</a>). <a href="https://infocenter.nordicsemi.com/topic/ps_nrf5340/ipc.html?cp=3_0_0_6_15">IPC</a> on the other hand is used to communicate between the cores under normal operations, sending events back and forth. So IPC is what you want in this case. From a firmware perspective, you can start by looking at <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_nrf5340.html#inter-core-communication">Inter-core communication</a>.</p><div style="clear:both;"></div>