| 摘要 |
PURPOSE:To obtain a two-way shift register which generates a random number sequence of two-way and can secure a random state of 2<n>. CONSTITUTION:When a control signal SL is at a high level, an output K1 of a combination logic circuit 31 and output R0, R1 and R2 of D flip flop(F/F) 10, 11 and 12 are respectively selected by selectors 20, 21, 22 and 23, and respectively inputted to F/F 10, 11, 12 and 13. And, when the control signal SL is at a low level, outputs R1, R2, and R3 of F/F 11, 12, and 13, and outputs of a combination logic circuit 32, are respectively selected by selectors 20, 21, and 22, and respectively inputted to F/F 10, 11, and 13. When the output R0-R3 are made a state of one before a stack state, output of exclusion OR circuits 4 and 7 are respectively inverted by exclusive OR circuit 6 and 9. |
