Online Digital Electronics Test - Digital Electronics Test 4

Instruction:

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Once a signal is digitized, the information it contains does not ________ as it is processed.

complain

stiffen

compress

deteriorate

[#]

A computer will use ASCII code to store information internally.

True

False

[#]

The logic expression for a NOR gate is ________.

[#]

It is important to memorize logic symbols, Boolean equations, and truth tables for logic gates.

True

False

[#]

The output of an AND gate is HIGH when any input is HIGH.

True

False

[#]

For the device shown here, assume the D input is LOW, both S inputs are LOW, and the input is LOW. What is the status of the outputs?

All are HIGH.

All are LOW.

All but

are LOW.

All but

are HIGH.

[#]

Looping on a K-map always results in the elimination of:

variables within the loop that appear only in their complemented form.

variables that remain unchanged within the loop.

variables within the loop that appear in both complemented and uncomplemented form.

variables within the loop that appear only in their uncomplemented form.

[#]

VHDL was created as a very flexible language and it allows us to define the operation of clocked devices in the code without relying on logic primitives.

True

False

[#]

A(n) ________ one-shot starts a pulse in response to a trigger and will restart the internal pulse timer every time a subsequent trigger edge occurs before the pulse is complete.

non-retriggerable

retriggerable

high-level triggered

edge-triggered

[#]

10.

ROMs retain data when the ________.

power is off

power is on

system is down

all of the above

[#]

11.

The condition occurring when two or more devices try to write data to a bus simultaneously is called ________.

address decoding

bus contention

bus collisions

address multiplexing

[#]

12.

Select the statement that best describes Read-Only Memory (ROM).

nonvolatile, used to store information that changes during system operation

nonvolatile, used to store information that does not change during system operation

volatile, used to store information that changes during system operation

volatile, used to store information that does not change during system operation

[#]

13.

Address decoding for dynamic memory chip control may also be used for:

controlling refresh circuits

read and write control

chip selection and address location

memory mapping

[#]

14.

ROM access time is defined as ________.

how long it takes to program the ROM chip

being the difference between the READ and WRITE times

the time it takes to get valid output data after a valid address is applied

the time required to activate the address lines after the ENABLE line is at a valid level

[#]

15.

Most PAL devices have a tristate buffer driving the input pins.

True

False

[#]

16.

The JTAG signals are named TDI, TDO, TMS, and TCK.

True

False

[#]

17.

An EPM 7128S in a ________ PQFP package has 12 I/O per LAB plus 4 additional input-only pins for a total of 100 pins.

100-pin

120-pin

140-pin

160-pin

[#]

18.

The SUBDESIGN section defines the input and output of the logic circuit block.

True

False

[#]

19.

One CASE construct inside another CASE construct is called a do-loop.

True

False

[#]

20.

A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):

Ex-NOR gate

OR gate

Ex-OR gate

NAND gate

[#]

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Online Digital Electronics Test - Digital Electronics Test 4

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