[DRC 23-20] Rule violation (PDCY-4) CARRY4 unconnected input - CARRY input pin(s) ethernet_top/ip_receive/FSM_onehot_rx_state_reg[7]_i_12/DI[3:0] are unconnected. These pins must be connected to a signal or tied to VCC or GND when output pin ethernet_top/ip_receive/FSM_onehot_rx_state_reg[7]_i_12/CO[3] is used.