Figure 2.11 shows the circuit required for the ECTTRIGIN handshaking. You can bypass the synchronization if all the subsystems are synchronous, by asserting the relevant bit of ECTTISBYPASSIN[7:0] HIGH.

Figure 2.12 is an example of a timing diagram of the circuit shown in Figure 2.11, when ECTTISBYPASSIN is inactive so enabling the synchronization logic.