A method and apparatus to control data readout of a pixel array which converts light into electrical signals. A readout circuitry is coupled with the pixel array to read out the pixel array. A halt circuitry to halt the readout circuitry from reading out the pixel array when the halt circuitry receives a flow control signal is coupled with the readout circuitry. A sense circuitry sends a flow control signal to the halt circuitry when the sense circuitry senses an overload of data transmitted from the pixel array to an interface.