| 摘要 |
PURPOSE:To increase the number of outputs of a sequence selecting circuit 2X times without increasing the number of ROMs by providing two ROMs, x-number of selecting signals, 2X-number of registers, and a selecting circuit. CONSTITUTION:A register 4 is selected when a selecting signal 11 is '00', and a register 5 is selected when this signal is '01', and a register 6 is selected when this signal is '10', and a register 7 is selected when the signal is '11'. In the initial state, a condition signal 9 is as shown by K in the figure, and a number signal 10 is as shown by (a), and circuit output signals from registers 4-7 are as shown by A-D. When the signal 9 is changed from K to l, the signal 11 is changed to '01', and the signal 10 is changed to (e), and an output signal 13 of a ROM2 goes to E. Since the signal 11 is '01', the output signal 13 of the ROM is sampled by the register 5, and a circuit output signal 19 of the register 5 is changed to E. Hereafter, circuit output signals 20, 19, and 21 are changed in order according as the signal 9 is changed to (m), (n), and (o), and as the result, circuit output signals 14-17 go to A, G, F, and H. |
