CIRCUIT DESIGN OF HDB3 BASED ON CPLD;

The HDB3 code(high density bipolar order3 encoding) keeps the feature of polarity inversion of AMI code,which reduces the length of zeros,therefore beneficial for extraction of timing message.

This article expounds the design proposal for HDB3 code\'s simulation system with SystemView.

The HDB3 code, for in no direct current components, less lower frequency components and no more than three continuous zreos, has become the most common-use code in digit-baseband communication.

This paper proposed a way of high density bipolar three HDB3 code based on ISP(in-system programmable digital circuits)device.

The design concept for encoder of HDB3 code is that firstly find the crab code \'V\',and make sure if the wreck code \'V\' conforms to 1 or 0 in the 3rd symbol.

In this paper,a HDB3 encoding system was designed based on VHDL.

The HDB3 encoding mechanism is typically used in baseband signal encoding and decoding,which has zero DC bias by alternating voltage level and the power consumption is reduced.

Design of HDB3 Codec Based on FPGA;

Design of HDB3 Coder Based on DSP Builder;

In order to resolve this problem,this text is going to apply hardware description language VHDL to proceed the systematical design;and focus on the introduction of the checking equipment strucure of new type of portable cable for warship uses,the design and approach of software and hardware,and the electrocircuit emluator by using HDB3 coder.