( 3 ) the thesis introduces the dds ( direct digital synthesis ) technology , compared with the other available schemes . the signal source which can produce the arbitrary wave ( also named arbitrary waveform generator ) is designed based on < wp = 6 > dds , in order to improve the performance of the awg . the scheme takes the cpld ( complex programmable logic device ) as the control core for the awg based on the dds technology so as to realize to digitally produce the waveform ( 3 )对直接数字合成技术dds ( directdigitalsynthesis )进行了分析，通过对各种方案的比较，应用dds技术设计了任意波形发生器awg ( arbitrarywaveformgenerator ) ，为了能提高该信号源的参数指标和便于实验操作，本方案选择了以复杂可编程逻辑器件cpld ( complexprogrammablelogicdevice )为控制核心组成dds任意波形发生器系统，实现了波形参数的全数字化远程控制。
The system comprises three modules : the first is the ccd driver module , which controlled with cpld . programming the cpld to produce ccd driving pulses and synchronized communication signals . after preprocessing , the output video signals are transmitted into high resolution adc module , in which they are converted into digital signals , and then processed in arm processing module 整个系统分为三个模块: ccd驱动模块的核心是一片复杂可编程逻辑器件( cpld ) ,对其编程产生ccd的驱动脉冲及同步控制信号;视频输出信号经预处理后,由高精度ad转换模块进行采样,将ccd输出的模拟信号转换成数字量;最后,将数据送入arm处理系统中进行后续处理。
So programmable logic device ( pld ) as field programmable gates ( fpga ) and complex programmable logic device ( cpld ) are used widely . the advanced technology of hardware designs using these programmable logic devices develope quickly . pci local bus is intended for use as an interconnect mechanism between highly integrated peripheral controller components , peripheral add - in boards , and processor / memory systems 因此,现场可编程门阵列fpga ( fieldprogrammablegates ) 、复杂可编程逻辑器件cpld ( complexprogrammablelogicdevice )这些可编程器件得到了广泛的应用,基于这些可编程器件的先进硬件设计技术得到了迅速的发展。
With rapid developments of system on chip ( soc ) , programmable logic devices ( pld ) , including complex programmable logic device ( cpld ) and field programmable gate array ( fpga ) , can support in - system programmability ( isp ) and become more popular in the world . this requires better download cables than before , which are used to program plds 随着片上系统( soc , systemonchip )时代的到来,包括复杂可编程逻辑器件( cpld , complexprogrammablelogicdevice )和现场可编程门阵列( fpga , fieldprogrammablegatearray )的可编程逻辑器件,具有系统内可再编程的独特优点,应用越来越广泛。
1 . a small and cheap 8 - bit microcontroller is used as control core . all components of the sensor , some of which are necessary for the multiple and intelligent functions , are selected ones with low cost and small package . by designing all auxiliary logic circuits in a complex programmable logic device ( cpld ) , and integrating all analog circuits in an application specific ic ( asic ) , the size of pcb board is greatly reduced , which make it possible that the pcb can be installed with the displacement detector together 系统采用小型廉价8位微控制器控制，电路内配置了为实现多功能智能化所必需的硬件，并全部采用低价格、小体积器件，还将所有辅助逻辑电路设计在一片复杂可编程逻辑器件cpld内，所有模拟电路集成于一片专用集成电路asic内，大大缩小了电路板尺寸，再与传感元件组装在一起，从而使整个系统在保证智能化功能的前提下，具有体积小、成本低、一体化和抗干扰能力强的特点。
The paper analyses the features of mmc2107 in detail , designs circuit diagram of the software debug platform , presents an accurate description of the logic symbol in complex programmable logic device , gives a detailed discussion about the operating mechanism of target resident kernel and the customization of the system software 文中详细地分析了mmc2107的功能特性，设计了软件调试平台硬件电路，给出了复杂可编程逻辑器件的内部逻辑图，论述了驻留程序的工作机制并定置了系统程序。
This dual - loop strategy is analysed completly and simulated . the implementation strategy is using digital and analogous hybrid control . the voltage loop is realized by dsp , and the inner - loop is realized by analogous circuit the design of cpld which simplified signal - phase cascade inverter circuit is also introduced in this paper 根据控制方案设计了采用数模混合方案的控制电路,电压外环采用dsp控制,实现输出电压有效值计算、 pi调解、输出限幅等操作,电流内环采用模拟电路实现,并基于复杂可编程逻辑器件cpld设计了载波移相电路和死区产生电路,简化控制电路。
In data sampling circuit , high - speed , complex programmable logic device cpld technique is used . high - speed double - port ram , control sampling time sequence logic , cpu interfaces and bus circuit are implemented in cpld . sampling speed is up to 80mhz , sampling depth is ik - byte , and cpld can fulfill the requirement of the software arithmetic to sampling 在数据采集电路中采用了高速复杂可编程逻辑器件cpld技术，芯片内设计有高速双端口ram 、控制采样时序逻辑及cpu接口、总线等电路，采样速率高达80mhz ，采样深度1k字节，很好地解决了超声波微位移传感器软件算法对采样的要求，并可实现在线升级，大大提高了系统的整体性能。
The multifunction image network monitor system based on ethernet adopt network control chip lan91c111 as the communication interface as well as the dedicated image processing chip tms320c6211b and complex programmable logic device epm7256ae to complete sampling and processing of the real - time digital image signals 摘要基于以太网的多功能图像网络监控系统，采用网络控制芯片lan91c111作为通信接口，用专用图像处理芯片tms320c6211b及复杂可编程逻辑器件epm7256ae进行实时数字图像信号的采集和处理。
In this paper , according the pratical needs and based on the study of system theory of microcontroller 80cl96kc , discussed a method to implement the transformer test unit with complex programmable logic device ( cpld ) . under the detailed analysis of sja1000 , the transformer test unit use can bus to perform the communication with others . the paper discussed particular the principle and circuit implementation of the ttu ' s store 本文在分析了单片机80c196kc的系统原理的基础上，根据实际应用需要，论述了一种利用复杂可编程逻辑器件cpld实现变压器终端的方法。通过对sja1000的详细分析，实现了利用can总线来进行变压器终端的通讯。本文详细阐述了变压器终端的存贮、通讯和显示的原理和电路实现。
