Abstract: T he feature of graphics of EHSI( Electronic Horizontal Situation Indicator) in aircraft cockpits and the difficult ies in development are introduced, and a new design scheme of EHSI graphics display system based on a newstructure of frame buffer is presented, which has characteristics of double frame buffer alternation and automatic vanishing screen, and can make the time needed for generating air craft compass graphics shorten by one2third; fur thermore, r eferring to the principle of movie2shade, it controls the system to display on the one-frame-two-display mode,which can double the system bandwidth. Those design methods reduce the burden of the main processor greatly,improve the speed of graphics generation, and solve the bottleneck of speed in the design of EHSI. The system structure and the design met hods of t he video controller and the frame buffer controller with FPGA ar e detailed.

Key words: EHSI, graphics display system, instruments, graphics frame buffer, FPGA, DSP