基于减少确定位的动态LFSR重新播种方法

LFSR Reseeding Methodology Based on Reducetion of the Special Bits

针对SOC测试需要大量测试数据的问题,提出了一种基于减少确定位的动态LFSR重新播种的改进方法。该方法利用LFSR数据压缩方法只与测试向量中所含的确定位有关的特点,运用测试向量分组、相容压缩方法,减少测试集中包含的确定位位数,从而减少所需的总存储位数。利用这种改进的方法,不仅提高了编码效率,减少了测试向量的生成时间,还大大地减少了外部测试器的存储需要。

This paper aims to solve the problem of massive testing data in SOC,presents a new methodology of partial dynamic LFSR reseeding based on data partition.In order to reduce the storement of the test data,we made Use of the data partition and consistence between the test vectors to reduce the special bits in the test vectors.It can reduce the time used to generate the test vectors by using this method.Based on the full static LFSR method,the new form of LFSR has higher encoding efficiency,and can generate each test vector in fewer clock cycles,and hence greater reduction in test data storage requirements.