Digital Signal Input Module Design In General Test Equipment

Digital signal input module,the part in General Test equipment,mainly transmit PCM data and CAN bus data through LVDS back plant and USB interface into PC. PC would introduce the transmitted data,show signal state and the signal information.The thesis gives the function analysis of the General Test equipment and the scheme of the digital signal transmission module,refers to scheme practice test, hardware choice,software program,universality and extensity.The thesis concentrates in the LVDS bus,PCM decoding,CAN bus key technology.In addition, the paper combine anti-jamming question and put forward various kinds of anti-jamming measurements to the system.It includes electrical source design,PCB board arrangement,central control logic design and the anti-jamming design of software,etc.The module takes FPGA as the central controller,LVDS bus and CAN bus as transmitter interface with strong universality and extensity.The important and difficult problems that was faced is analyzed adequately when I was design and debugging,at the same time it was demonstrated and explained as the important.It was generalized as follows:1,the LVDS bus interface technology application2,PCM decoding design in FPGA.3,data transmission in the CAN bus4,universality designFinally,the thesis offers some thoughts on the digital signal input module with the need to be changed.