| 摘要 |
PURPOSE:To test and evaluate the whole logical circuit including flip-flops at a time by constituting the logical circuit so as to be operated by regarding each flip-flop as a kind of gate at the time of test and evaluation and inputting an input signal to the flip-flop in parallel to observe the output. CONSTITUTION:When a signal generating circuit 6 and a switching circuit 5 are connected to each of all the flip-flops constituting said logical circuit, it is unnecessary to fix the output of the flip-flop by actuating the flip-flop with a system clock at the time of test and evaluation. In addition, these flip-flops can be used as gates. If a switch S1 is turned on simply by a control signal Pc without changing the logical constitution of the circuit at the time of test and evaluation to input an input signal (a) to the flip-flop 4, the signal generating circuit 6 generates an operation clock signal C for the flip-flop 4 automatically on the basis of the input signal (a). Consequently, the relation between the input and output can be recognized clearly when the logical circuit is tested and evaluated. |
