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Q. |
Refer to the given figures (a) and (b). A logic analyzer is used to check the circuit in figure (a) and displays the waveforms shown in figure (b). The actual analyzer display shows all four data outputs, Q0-Q3. The analyzer's cursor is placed at position X and all four of the data output lines show a LOW level output. What is wrong, if anything, with the circuit? |
A. | nothing is wrong, according to the display. the outputs are in the open state and should show zero output voltage. |
B. | the circuit is in the read mode and the outputs, q0-q3, should reflect the contents of the memory at that address. the chip is defective; replace the chip. |
C. | the circuit is in the mode and should be writing the contents of the selected address to q0–q3. |
D. | the q0–q3 lines can be either low or high, since the chip is in the tristate mode in which case their level is unpredictable. |
Answer» D. the q0–q3 lines can be either low or high, since the chip is in the tristate mode in which case their level is unpredictable. |
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