Which of the following equations would accurately describe a 4-input OR gate when A = 1, B = 1, C = 0, and D = 0?
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1 + 1 + 0 + 0 = 1 -
1 + 1 + 0 + 0 = 01 -
1 + 1 + 0 + 0 = 0 -
1 + 1 + 0 + 0 = 00
The comments in ADHL are enclosed between # characters.
-
True -
False
VHDL is not a new language.
-
True -
False
A NOR gate with one HIGH input and one LOW input:
-
will output a HIGH -
functions as an AND -
will not function -
will output a LOW
A NAND gate has:
-
active-LOW inputs and an active-HIGH output. -
active-LOW inputs and an active-LOW output. -
active-HIGH inputs and an active-HIGH output. -
active-HIGH inputs and an active-LOW output.
What is the basic difference between AHDL and VHDL?
-
ADHL is used in all PLD's. -
VHDL is used in all PLD's. -
ADHL is proprietary. -
VHDL is proprietary.
A NAND gate has:
-
active-LOW inputs and an active-HIGH output. -
active-LOW inputs and an active-LOW output. -
active-HIGH inputs and an active-HIGH output. -
active-HIGH inputs and an active-LOW output.
Which of the examples below expresses the distributive law?
-
(A + B) + C = A + (B + C) -
A(B + C) = AB + AC -
A + (B + C) = AB + AC -
A(BC) = (AB) + C
A small circle on the output of a logic gate is used to represent the:
-
Comparator operation. -
OR operation. -
NOT operation. -
AND operation.
For a three-input AND gate, with the input waveforms as shown below, which output waveform is correct?
-
a -
b -
c -
d
An OR gate with inverted inputs functions as:
-
an AND gate. -
a NAND gate. -
a NOR gate. -
an inverter.
In a text-based language, the circuit being described must be given a name.
-
True -
False
Which of the following is a form of DeMorgan's theorem?
The special software application that translates from HDL into a grid of 1's and 0's, which can be loaded into a PLD, is called a:
-
formatter. -
compiler. -
programmable wiring. -
CPU.
Which of the figures given below represents a NAND gate?
-
a -
b -
c -
d
Which of the figures given below represents a NOR gate?
-
a -
b -
c -
d
The timing diagram for a two-input NAND gate is shown below. The gate is working correctly.
-
True -
False
For a three-input NOR gate, with the input waveforms as shown below, which output waveform is correct?
-
a -
b -
c -
d
For a three-input NOR gate, with the input waveforms as shown below, which output waveform is correct?
-
a -
b -
c -
d
Which of the examples below expresses the distributive law?
-
(A + B) + C = A + (B + C) -
A(B + C) = AB + AC -
A + (B + C) = AB + AC -
A(BC) = (AB) + C