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在核物理实验中,常常需要对多路脉冲信号进行幅度分析及数据获取.通常使用多路模拟混合方式予以实现,也有采用DMA链的方式.本文介绍的接口电路不用模拟混合器,而采用对两路ADC变换的二进制码分别进行及时锁存、DMA分时进入的方式来实现两路数据获取,线路的组成比较简单而传送速率较快.本接口电路主要分为四个部份:顺序控制电路产生顺序控制信号,以保证两路数据代码按“先来先送,后来后送”的原则进入地址总线;地址形成电路将ADC变换的数据代码及予置的高位地址代码,变成对应两路数据存贮区的RAM+1所需的地址码;
In the nuclear physics experiment, often need to carry on the amplitude analysis and the data acquisition to the multichannel pulse signal, usually adopt the multichannel simulation to mix the way to realize, there is also the way that adopts DMA chain.The interface circuit that this text introduces does not need to imitate the mixer, The binary code of the two ADCs are latched in time and the DMA enters in a time-sharing manner to achieve two-way data acquisition. The composition of the circuit is relatively simple and the transmission rate is faster. The interface circuit is mainly divided into four parts: sequential control The circuit generates a sequence control signal to ensure that the two data codes enter the address bus according to the principle of “first come, first come first, then evacuation”; the address forming circuit converts the ADC converted data code and the preset upper address code into the corresponding two Address data required for RAM + 1 of the data memory area;