The circuit of Figure P13.71 can operate as a 4-to-16 decoder. Terminal EN denotes the enable input. Describe the operation of the 4-to-16 decoder. What is the role of logic variable A?
Analysis:
Assuming that the enable input (EN) is active high, when EN is logic 0 (A is logic 1), all decoder outputs of the first decoder are forced to logic 1 independent of the inputs. However, when EN is logic 1 (A is logic 0), all decoder outputs of the second decoder are forced to logic 1 independent of the select inputs. Therefore, A functions as the fourth bit of the select inputs. Thus, the circuit operates as a 4 of 16 decoder.
You might also like to view...
Milkers check for a disease known as ____________________, which shows symptoms like lumps or blood in the milk
Fill in the blank(s) with correct word
What is the maximum extending force of a hydraulic cylinder having a diameter of 3.00 inches and a ram diameter of 1.50 inches if the hydraulic pressure applied is 2,300 psi? Round to the nearest hundred pounds
What will be an ideal response?
In the final finish grinding on a hardened workpiece, the traverse rate should be reduced to about how much of a grinding wheel width per workpiece revolution?
A) Three-fourths B) One-eighth C) One-half D) One-fourth
Which of the statements concerning parallel circuits is NOT true?
A. The total circuit resistance is always lower than the resistance of the leg with the lowest resistance B. The current through each leg will be different if the resistance of the loads in each leg is different C. The sum of the current of all the legs is the total circuit current D. The combined voltage drop of all the legs equals the total voltage drop