A Test Data Compression Method of Fore-Compatible Marked Codes of Data Blocks

This paper proposes an encoding compression method，which is similar to a dictionary index. To compress test data，the data blocks which are compatible with the reference data blocks are marked by “1” in the proposed method.Its decompression architecture requires only a finite state machine and a cyclical scan register whose length is the same as that of the data block.Compared to the length of the cyclical scan register required in Golomb and FDR codes，which is equal to the length of the test vector，hardware cost in the proposed method is less than that in Golomb and FDR codes.Experimental results show that our method can efficiently compress test data and outperform Golomb codes and FDR codes.