DE Ch6

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21 Terms

1
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The effectiveness of a simulation depends on choosing input waveforms that will tell everything that needs to be known about the operation of a design

True

2
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The electrical requirements for an LED circuit are simple

True

3
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A digital decoder activates a specified output for a unique digital input code; an encoder operates in the reverse direction.

True

4
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A demultiplexer performs the reverse function of a multiplexer

True

5
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If a circuit is known to have been designed and built correctly, it still might fail due a failure of one or more of its components

True

6
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A ____ is an array of seven independently controlled light-emitting diode (LED) or liquid crystal display (LCD) elements, shaped like a figure 8, which can be used to display decimal digits and other characters by turning on the appropriate elements

Seven-segment display

7
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Decoder circuits often are constructed with multiple outputs; in effect, such a device is a collection of decoding gates controlled by the same _________

inputs

8
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With regard to hex digits, to make _____ distinct from b, the former must be given a tail (segment a)

6

9
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A _________ directs a single input signal to one of several outputs

demultiplexer

10
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____________ is a naming convention where two or more numerically related groups of signals are named using two subscript numerals

double-subscript notation

11
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What are the multiplexer inputs that feed a digital signal to the output when selected

Data inputs

12
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______________determine whether one binary number is less than, greater than, or equal to another binary number

Magnitude comparators

13
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An error-checking system that requires a binary number to have an even number of 1s is:

Even parity

14
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________________ is the verification, using timing diagrams, of the logic of a digital design before programming it into a CPLD or an FPGA

Simulation

15
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A _____ is a circuit with a 4-bit input for a BCD digit and seven outputs for segment selection

BCD to seven segment decoder

16
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A(n) ___________ is a circuit that generates a binary code at its outputs in response to one or more active input lines

encoder

17
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A diagram showing how two or more digital waveforms in a system relate to eachother overtime is a:

Timing diagram

18
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The ripple blanking feature often included in a ________ allows for suppression of leading or trailing zeros in a multiple digit display, while allowing zeros to be displayed in the middle of the number

7 segment decoder

19
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The general function of a ___________ is to activate one or more outputs when a specific set of values is applied to the circuit's inputs

decoder

20
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A circuit that directs one of several digital signals to a single output, depending on the states of several select inputs, is a:

multiplexer

21
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Simplest type of decoders

NAND, AND