I presume you have several evaluation boards and want to run them in sync, right?
This can be either made in daisy-chain mode (see manual page 25). In this case only the master board can trigger the slave boards. If you need to trigger on SEVERAL boards (like a coincidence between two boards), you have to do this with an external trigger and busy logic. This is rather
complicated and needs detailed explanations. So come to my office and I will teach you.