HDB3 yards ( third-order high-density dual polarity yards) is the most commonly used in modern transmission system is one of the MaXing， is widely This study is based on the main content of the HDB3 yards encoder CPLD device First of HDB3 yards and CPLD application and research status were introduced， This paper used to MaxPlusII and VHDL language software， Finally HDB3 yards are analyzed in detail by VHDL language encoding principle and realization Based on the principle of coding HDB3 yards， the paper analyzes the design scheme of HDB3 code design mainly divided into three coder realized module ( insert V module， modeling and realize the modeling and realization， B module modeling and realize polarity transform module) After completion， the software design in the simulation， MaxPlus2 test results and the design idea of early， so right， completed based on simulation HDB3 code design of CPLD
PickHDB3 yards ( third-order high-density dual polarity yards) is the most commonly used in modern transmission system is one of the MaXing， is widely This study is based on the main content of the HDB3 yards encoder CPLD device First of HDB3 yards and CPLD application and research status were introduced， This paper used to MaxPlusII and VHDL language software， Finally HDB3 yards are analyzed in detail by VHDL language encoding principle and realization Based on the principle of coding HDB3 yards， the paper analyzes the design scheme of HDB3 code design mainly divided into three coder realized module ( insert V module， modeling and realize the modeling and realization， B module modeling and realize polarity transform module) After completion， the software design in the simulation， MaxPlus2 test results and the design idea of early， so right， completed based on simulation HDB3 code design of CPLD Keywords: HDB3， VHDL， Polarity transformation
Based on the communication network Direct3D visual simulation engine design and implementationtheVisual Simulation (Visual Simulation) is used to realize 3 d space information visualization technology， it has a realistic Simulation effect and convenient operation method， can well satisfy the new plane avionics system design This paper designs and realizes an Direct3D based on the communication network visual simulation First， in this paper the characteristics of the visual simulation and the programming essentials Direct3D brief analysis of selection， and expounds the main reason for the Direct3D Secondly， put forward the visual simulation software， the total design project of the simulation software program and the software module partition the working process of the analysis of the various modules， explore the main functions and the relations among And then， based on the communication network of Direct3D visual simulation is the key technology of engine are analyzed and the study， introduces solutions discrete event simulation， Direct3D resource management and animation optimization and the mouse control technology， the key technology of the Finally， this essay discusses the Direct3D based on the communication network visual simulation software realization method， and in a more complex switched communication network as an example， the visual simulation， and the performance of the program was tested
