Digital Systems: From Logic Gates to Processors Week 1 Quiz Answer

Digital Systems: From Logic Gates to Processors Week 1 Quiz Answer

In this article i am gone to share Coursera Course: Digital Systems: From Logic Gates to Processors Week 1 Quiz Answer with you..

Graded Quiz 1 Answer

Question 1)

Which of the following statements are true? Check all that apply.

Any block in a digital circuit can be described hierarchically until a level of simplicity that allows its synthesis using a predefined catalog of components is achieved.

Any digital system can be specified using a functional description or a structural description.

The functional description of a digital system depicts its internal structure.

All blocks of a hierarchical description must be specified by the same type of description (functional or structural).

Question 2)

In a stress test for elite athletes a physical system is used to measure the performance of the individual. Indicate which of these signals are analog signals:

ECG (Electrocardiogram) ⇒ Type: Voltage; Range: [0.5-4 mV].
Temperature ⇒ Type: Temperature, Range: from 18ºC to 22ºC (only integer and half-integer values are measured)
Activity level (accelerometer) ⇒ Type: Current, Range: [0-7 mA]
Weight ⇒ Type: Weight; Range: [25-100 kg]
Performance ⇒ Type: Real number; Range: [0-1]
Alarm ⇒ Type: Binary digit , Range: {0,1}

Question 3)

Following the previous question, indicate which of the following signals are digital signals.

ECG (Electrocardiogram) ⇒ Type: Voltage; Range: [0.5-4 mV].
Heart rate ⇒ Type: Numeric; Range: Integers from 35 to 300
Respiratory Rate ⇒ Type: Numerical; Range: integers from 8 to 40.
Performance ⇒ Type: Real number; Range: [0-1]
VO2 ⇒ Type: Liters / minute; Range: [2-7.5 l / min].
Alarm ⇒ Type: Binary digit; Range: {0,1}.

Question 4)

Consider the following structural description. Check which blocks are digital systems.

Question 5)

Which of the following algorithms compute P? Mark all that apply.

A <= 0; B <= X;

for i in 0 to 3 loop

A <= A + y(i)*B;

B <= B*10;

end loop;

P <= A;

P <= 0; A <= X;

for i in 0 to 2 loop

P <= P + y(i)*A;

A <= A*10;

end loop;

P <= P + y(3)*A;

A <= X;

for i in 0 to 2 loop

P <= P + y(i)*A;

A <= A*10;

end loop;

P <= P + y(3)*A;

Question 6)

Consider a system with three input signals:

ref, a square wave with a period of 1 microsecond(1), and
two natural number a and b

The system generates a square wave, f, with period equal to (a + b) microseconds, as shown in figure.

Which of the following algorithms describe the system?

(1) Variable "ref_positive_edge" takes the value TRUE when a positive edge of signal "ref" arrives, and FALSE otherwise.

loop

f <= 1; count <= a;

while count > 0 loop

if ref_positive_edge = TRUE then count <= count - 1;

end if;

end loop;

f <= 0; count <= b;

while count > 0 loop

if ref_positive_edge = TRUE then count <= count - 1;

end if;

end loop;

Question 7)

Mark the correct statement:

In a 5V powered circuit, the logical value 1 is defined as a voltage of exactly 5V.
Digital electronic systems only work with supply voltages of 0 and 1V.
In CMOS circuits (circuits built with CMOS gates) logical values of 1 and 0 are defined as the passage or non-passage of current, respectively.
Logical values of 0 and 1 are defined as a voltage close to 0 V and a voltage close to the circuit supply voltage respectively.

Question 8)

Fill in the above table so that it describes the behavior of the following circuit: