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
SummaryHDB3 code (that is， the third order high-density bipolar code) is a modern transport system in the most common code， application is very The main content of this article is based on the CPLD HDB3 encoder First of all on HDB3 codes and CPLDs development are discussed in this article， and to the software used and the introduction of VHDL language MaxPlusII; finally a detailed analysis of the principle of coding HDB3 codes and VHDL HDB3 codes by coding theory analysis， this design on HDB3 encoder design are divided into three modules step-by-step implementation (Plug-and-V module modeling and implementing the modeling and implementing module B， polar transform module modeling and implementation) Complete the design content in software MaxPlus2 on simulation， testing results and design ideas at the start of the match， so the simulation is correct， complete based on the CPLD HDB3 encoder
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