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
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
HDB3 code (ie， high density bipolar order code) is a modern transport system， one of the most common pattern， applied very The main contents of this paper is based on the CPLD's HDB3 encoder First on the HDB3 code and CPLD applications and current research introduced; then use the software on this article and the VHDL language MaxPlusII brief; last detailed analysis of the HDB3 code coding principle and method of using VHDL By coding HDB3 code theory， this paper's design on HDB3 Encoder Design is divided into three modules step by step implementation (plug-V module modeling and implementation， modeling and implementation modules make up B， polar transformation Module Modeling and Implementation) After completion of the design elements， software MaxPlus2 on the simulation test results obtained with the initial design of the idea of line， so simulation is correct， complete CPLD-based design HDB3 E
Whether the circuit breaker charged detection is a very important problem， in relation to the operation of the system stability and Through the integration of the detection amp circuit composed by receiving signal detection frequency-field analog signal converting digital signal input micro control Judging by the control unit of output control signal control alarm device， whether to alarm circuit breakers Detection unit by differential input inspection effectively improve the fractional detection range and improve the detection The whole system of linear low voltage difference through power for the system， chip stable job provides
