Two-stage synchronous RS-flip-flop, -triggers, T-flip-flop...

Two-stage synchronous RS-trigger

In Fig. 13.10 shows the scheme of the single-stage trigger (a) and the time diagrams (b), illustrating its operation. The first stage is switched on the front of the signal C, the second is on the edge of the signal , so the output signal Q changes at the output of the two-stage trigger occurs on the cutoff C. It is said that the trigger switches over the cut sync pulses. At the first step when data is written to the first stage, the second stage of the flip-flop is in the storage state, the first stage in the storage state is the first stage and the data is rewritten to the output of the second stage. A two-stage Db'-trigger also has a forbidden combination of input signals.

-triggers

In Fig. 13.11 shows two circuit solutions of D-flip-flops (a) and time diagrams (b), illustrating their operation. As follows from the time diagrams, in both triggering schemes, the same processes occur. The signal at the input of the flip-flops changes on the nerve and the third clock after passing through C. The state of the flip-flops changes along the front C at the beginning of the second and fourth measures.

Fig. 13.10. Schematic of a two-stage synchronous RS trigger on NAND elements (a) and timelines (b) , explaining the principle of his work

T-flip-flop

In Fig. 13.12 shows the trigger circuit ( a ) and the time diagrams (b), illustrating its operation. As follows from the time diagrams, the state of the trigger varies along the slice of each C-pulse, i.e. the output signal sequentially takes the values ​​ Q = 0 and Q = 1. Consequently, the T-flip-flop performs the functions of a single-bit binary counter.

-trigger

In Fig. Figure 13.13 shows the trigger circuit (a) and the time diagrams (b) illustrating its operation. The main feature of the JK -trigger is that unlike the two-stage RS -stigger described above, there is no forbidden combination in it. When signals J = K = 1 JK are used, the trigger acts as a T -trigger. In order to identify the processes occurring when a forbidden combination of signals is applied to the input of a forbidden combination of signals, the same sequence of signals is fed to its inputs as in the simulation of a two-stage RS -trigger. To trace the development of processes, an additional 9th ​​clock interval is introduced, on which the forbidden combination of signals is fed to the trigger inputs again. As follows from the time diagrams, when the trigger of the forbidden combination of signals J = K = 1 arrives at the input JK , its state changes to the inverse (7th and 9th measure).

Fig. 13.11. D-Trigger Schemes on NAND items (a) and time charts (b), explaining how they work

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