Visual attention is a voluntary mechanism allows human to allocate our sensory and computational resources to the most valuable information embedded in the vast amount of incoming visual data. Neuromorphic prosthetics with high-level cognitive function can be used to complete increasingly sophisticated tasks. Inspired by recent developments in the field of attention modulation, we propose a biological neural attention model for online visual attention and implement this model on Xilinx ZYNQ 7000 System-on-chip system.