In order to improve the reliability of the trigger operation, it is hoped that the state of the output can be changed only once in each CLK cycle, and the trigger of the pulse trigger is designed based on the trigger of the level trigger.
1. Master-slave SR trigger characteristic equation: Q*=S+R"Q, SR=0
2. During the master-slave JK flip-flop CP = 1, the master trigger receives the input signal; during CP = 0, the master flip-flop maintains the state before the falling edge of CP, and the slave trigger accepts the master flip-flop state. Therefore, the state of the master-slave flip-flop can only be toggled at the falling edge of the CP. This type of triggering is called master-slave triggering.
Q*=JQ"+K"Q
The action characteristics of the pulse trigger mode:
Trigger flip is divided into two steps: First, during the CLK=1, the main trigger receives the input signal, is set to the corresponding state, the slave flip-flop is unchanged; the second step, the CLK falling edge comes from the trigger Inverted according to the state of the main flip-flop, the state change of the output terminals Q and Q' occurs at the falling edge of CLK.
The input signal will control the main trigger during all times of CLK=1.
A change phenomenon:
When Q=0, the J-end has positive interference. When Q=1, the K-side has positive interference. The state of the trigger can only be changed once according to the input signal (forward interference signal). phenomenon.
The master-slave JK flip-flop requires the J and K signals to be added before the rising edge of CLK during use. The CLK=1 period remains unchanged, and the trigger state changes when the CLK falling edge.
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