一种基于IFDR改进的测试激励数据压缩方法

A Test Compression Method Based on IFDR Code

通过改进IFDR码,提出一种基于游程相等编码的改进FDR(ERFDR)方法.首先,该方法不仅能同时对原测试集的0游程和1游程进行编码,而且,当相邻游程相等时还可以用较短的码字来代替,从而进一步提高了压缩率.其次,还提出针对该压缩方法的测试集无关位填充算法,增强提出方法的压缩效果.实验结果表明,与FDR,EFDR,IFDR和ERLC相比较,本文提出的方法获得了更高的压缩率,降低了测试费用.

Based on equal runlength code and IFDR, a new coding method （called ERFDR） was pro- posed. Firstly, the proposed method can not only encode both 0 and 1 runs for a test set simultaneously, but also can use shorter code if the adjacent runlengths are equal. Therefore, the compression ratio can be further improved. This paper also put forward a new filling algorithm for a test set with don＇t care bits, which can enhance the compression efficiency of the proposed method. Experimental results show that the proposed method can obtain a higher compression rate compared with FDR, EFDR, IFDR and ERLC codes. The test cost can be reduced effectively.