Shift of input data without split by a shifter, generation of code extension data by a code extension data generator, and generation of a mask signal by a mask signal generator are carried out in parallel. The mask signal generator generates the mask signal based on an amount of shift and split mode...http://www.google.com.hk/patents/US6411980?utm_source=gb-gplus-share專利 US6411980 - Data split parallel shifter and parallel adder/subtractor
