REALIZATION OF INPUT TEST DATA VOLUME REDUCTION USING XMATCHPRO TECHNIQUE

Test data compression methods reduce the input test data volume by allowing compressed tests to be stored on a tester. Test data is data which has been specifically identified for use in tests, typically of a computer program.The compression architecture is based around a block of CAM to realize the dictionary.Input data is driven as a size of 32 bits, and the same output will appear as input using a dictionary technique. First the data is given to the comparator and the same stored in the memory, defined by the address, and then now the comparator performs the comparison between the given data and the locations in the memory. These outputs from the comparator is driven to Content Address Memory (CAM), which sends the data; depending whether it is one or zero from the comparator. If one, the cam doesn’t specify the output data, instead of that the stored address location will be driven to the output, with an indication of match hit one which indicates the matching of data. If zero, no data matches so the mismatched data will be seen at the output of compression module with a match hit of zero. Since the values of compression module is applied to the decompression module as input which operates with same clock, reset, match hit signal