Section 4. The Four Bit Data Register (a) Connect up the four bit data register

Question

Section 4. The Four Bit Data Register (a) Connect up the four bit data register as shown in Figure 6. A JK Flip-flop can be used as a 1-bit memory by applying the bit to be stored to J, and its inverse to K. An n-bit binary word can be stored by n such flip-flops; called a n-bit register. D1 CLK L CLK. Q Q Figure 6. The 4-bit Data register Connect the four flip-flops as shown in Figure 6. Connect a binary word to the data registers by connecting the inputs to lows and highs to insert whatever word you desire. Use a clock pulse to store this word. Reset the data register and store a new word. Describe what you did and what occurred? b) Is it possible to store a new word without resetting the register first? Why, or why not?

Explanation / Answer

(a) When you use a FLIP FLOP JK, with J and K being the opposite, the FLIP FLOP results in a FLIP FLOP D, that store a bit for each flip flop and you have only 1 input for each flip flop.

As you input a word (D3 D2 D1 D0) and have a clock signal, the output wil be the same (Q3 = D3 ; Q2 = D2 ; Q1 = D1 and D0 = Q0). When you reset (J= 0; K=1); all the outputs wil be in zero state (Q3 = Q2 = Q1 = Q0).

After you input a word (D3 D2 D1 D0) and have a clock signal, the output wil be the same (Q3 = D3 ; Q2 = D2 ; Q1 = D1 and D0 = Q0). But it is necessary to have another clock pulse.

(b) It is not necessary to reset the register first. But it is necessary a pulse clock and after this, the new word will be stored.

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