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?
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?
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
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Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text: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
Elert -
RAM
1 AO
1 A1
O A2
O A3
1 A4
O A5
1 A6
1 A7
256 X 4
A0-A7
R/W
A
255
CS
QO
Q1
Q2
DO-D3
O DO
1 D1
O D2
1 D3
Q0-Q3
Y
W
O R/W
O CS
WRITE
READ
EN
(b)
(a)
Address
inputs
Data
sznano
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