| 摘要 |
PURPOSE:To speed the shifting operation of more than one bit through simple hardware, by controlling shifters, which shifted data set in a register by one and four bits respectively, by a controller selectively according to the extent of the shift. CONSTITUTION:To shifters 15 and 17 which shift shifted data set in a register 11 by one and four bits respectively, a control signal is supplied through terminals 16 and 18 to control a multiplexer 19 by a control circuit 23 corresponding to the extent of a shift set in a register 22, thereby setting data of the shifters 15 and 17 in the register 11 selectively. Further, the output data of the multiplexer 19 is set in a four-bit link register 21 for data rotation and its outputs is inputted selectively to the shifters 15 and 17. Consequently, the one- and four-bit shifters are utilized selectively to simplify hardware, thereby speeding the shifting operation of more than one bit. |
