A descrambling method suitable for improving the data transfer rate and fast data processing is described. Scrambled data is separated into a plurality of data groups each including plural pieces of scrambled unit data. Initial scramble patterns are respectively assigned to the data groups. The method includes the steps of: (a) preparing an initial scramble pattern assigned to a specific data group; (b) generating a first scramble pattern by one clock cycle using the prepared initial scramble pattern; (c) preparing one of the scrambled unit data pieces in the specific data group; and (d) performing a descrambling operation using the first scramble pattern and the prepared one scrambled unit data piece to produce an original data piece. IMAGE
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