| 摘要 |
PCT No. PCT/JP91/00629 Sec. 371 Date Dec. 30, 1991 Sec. 102(e) Date Dec. 30, 1991 PCT Filed May 13, 1991.A bidirectional shifter according to the present invention is characterized by comprising a barrel shifter (52) that is composed of an MxN matrix of selectors (11), M arranged in the column direction according to the amount of shift and N in the row direction according to the data length, and that is capable of performing a right (or left) shift according to data indicating the amount of right (or left) shift, and data right/left reversing means (52, 53) provided at the input and output stages of the barrel shifter, respectively, which selects input data according to a shift control signal. With this configuration, a barrel shifter capable of a right (or left) shift is able to shift data both right and left as required.
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