Show your solutions clearly and systematically. The D latch of Figure 1 is constructed with four NAND gates and an inverter. Consider the following three other ways for obtaining a D latch. In each case, draw the logic diagram and verify the circuit operation. D En D Next state of Q En 0X No change 10 Q=0; reset state 11 Q-1; set state (a) Logic diagram (b) Function table Figure 1: D Latch 2. Use NOR gates for all four gates. Inverters may be needed. 2

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Show your solutions clearly and systematically.
The D latch of Figure 1 is constructed with four NAND gates and an inverter.
Consider the following three other ways for obtaining a D latch. In each case,
draw the logic diagram and verify the circuit operation.
D
En D
Next state of Q
En
0X
No change
10
Q = 0; reset state
Q-1; set state
11
(a) Logic diagram
(b) Function table.
Figure 1: D Latch
2. Use NOR gates for all four gates. Inverters may be needed.
Q
2
Transcribed Image Text:Show your solutions clearly and systematically. The D latch of Figure 1 is constructed with four NAND gates and an inverter. Consider the following three other ways for obtaining a D latch. In each case, draw the logic diagram and verify the circuit operation. D En D Next state of Q En 0X No change 10 Q = 0; reset state Q-1; set state 11 (a) Logic diagram (b) Function table. Figure 1: D Latch 2. Use NOR gates for all four gates. Inverters may be needed. Q 2
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