METHOD FOR PROVIDING SYNCHRONOUS OPERATION OF SEQUENCE LOGIC CIRCUIT AND DIGITAL LOGIC CIRCUIT

摘要

PURPOSE: To offer a synchronous operation and also to remove the disturbance of the holding time even in the presence of clock skews when a circuit sent from a user network list is carried out. CONSTITUTION: The synchronizer flip-flops 30a and 30b are connected to the corresponding original user flip-flops at the immediately upstream side from a data path led to the flip-flops 30a and 30b. A prescribed amount of delay is added to a user original lock signal and a data signal respectively. In regard to every master clock of a user network list, a synchronizing clock signal oscillator 46 induces a synchronizer clock that is delayed compared with the user original clock. The synchronizing clock is applied to the control lead of each synchronizer flip-flop and always reaches the synchronizer clock earlier than the user clock and the user data, and also regardless of the arrival order of these user clock and data.