加密可编程逻辑器件的广泛使用给进口电子产品的维修与维护带来较大困难 ,对加密芯片引脚类型的判别有助于解决系统中硬件故障的定位问题。文章通过分析可编程逻辑阵列器件的内部结构 ,提出了利用伪随机循环测试码进行芯片引脚类型判别的具体实施过程 The widespread use of encryption programmable logic devices brings great difficulties to the maintenance and repair of imported electronic products. The discrimination of the pin types of the encryption chips helps to solve the problem of hardware fault location in the system. By analyzing the internal structure of programmable logic array (FPGA) device, this paper presents the implementation of pin-type identification using pseudo-random cyclic test code