what is the start used for about ov7670-verilog HOT 1 CLOSED

The start signal triggers the finite state machine to begin the process of sending commands to the camera from the idle state. Its needed to allow for triggering the camera configuration independently of when the FPGA bitstream is loaded.

FSM_IDLE: begin 
                FSM_state <= start ? FSM_SEND_CMD : FSM_IDLE;
                rom_addr <= 0;
                done <= start ? 0 : done;
            end

from ov7670-verilog.