Latches and Flip Flops
Latches and Flip Flops
Latches and Flip Flops
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<strong>Flip</strong> <strong>Flops</strong><br />
@ P. Klimo<br />
D (Data) Latch.<br />
Figure 3: Implementation of D latch.<br />
Characteristic equation of D latch :<br />
Q* = D<br />
D Latch with Enable (transparent latch):<br />
Inputs Next State (*)<br />
D E Q* Comment<br />
0 0 Q n<br />
hold<br />
1 0 Q n<br />
hold<br />
0 1 0<br />
reset<br />
1 1 1 set<br />
TABLE 3.<br />
Example: Design of D Latch with Enable.<br />
Draw a K map for Table 3:<br />
D E<br />
Q 0 0 0 1 1 1 1 0<br />
0 0 0 1 0<br />
1 1 0 1 1<br />
Figure 4: K-map for Q*<br />
Characteristic Equation of transparent D latch: Q* = D.E + E’.Q<br />
4
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