Question d’entretien chez Microchip Technology

3.3V | ____________ z = R1 |Device 1 | |_____ Sig1--------------------->|Reset | |______________ _ Vf= 0.3v \/ Diode (D1) | Sig2------- ___________ | |Device 2 | |______ |-------------->| Reset |__________ What is the purpose of D1?