I’m guessing you’re two individual CSI cameras connect to Nano platforms; for example, LI-IMX219-MIPI-FF-NANO
since there’s no hardware sync pins for these two cameras. you’ll need software approach to have dual camera synchronization.
you may refer to Argus samples, syncSensor, which demonstrate a software approach for synchronization.
please also refer to similar discussion thread, Topic 111355 for more details.
thanks