vu cs201 Mid Term Subjective Solved Past Paper No.4

vu cs201 Introduction to Programming Solved Past Papers

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Question 1: Name the three declarations that are included in "declaration section" of the module that is created when an Input (source) file is created in ABEL.

Answer:

Device declaration
Pin declarations
Set declarations.

Question 2: One of the ABEL entry methods uses logic equations; explain it with at least a single example.

Answer:

In ABEL any letter or combination of letters and numbers can be used to identify variables. ABEL however is case sensitive, thus variable "Ais treated separately from variable "a?. All ABEL equations must end with ";? Boolean expression F = AB' + AC +(BD)' is written in ABEL as F = A & !B # A & C # !B & !D;

Question 3: Provide some of the inputs for which the adjacent 1s detector circuit have active high output?

Answer:

The Adjacent 1s Detector accepts 4-bit inputs. If two adjacent 1s are detected in the input, the output is set to high. input combinations will be 0011, 0110, 0111, 1011, 1100, 1101, 1110 and 1111. The output function is a 1. (Page 123)

Question 4: See the answer above S-R latch using NAND and NOR

Answer:

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Question 5: SOP to POS conversion

Answer:

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Question 6: Use Karnaugh map to find the minimum SOP form for following expression
F = (3, 5, 7, 8, 10, 12, 13, 14, 15)

Answer:

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Question 7: What does a 8-bit adder/subtracter circuit do?

Answer:

The Add/Subtract function select input are tied together. The Carry In of the 1st 4-bit Adder circuit is connected to the Add/Subtract function select input. The Carry Out of the 1st 4-bit Adder circuit is connected to the Carry In of the 2nd 4-bit Adder circuit. (Page 146)

Question 8: When an Input (source) file is created in ABEL a module is created which has three sections. Name These three sections.

Answer:

The three sections are:

1. Declarations

The declaration section generally includes the device declaration, pin declarations and set declarations. Device declaration is used to specify the PLD device that is to be programmed. The device is referred to as the target device. Decoder device "P22V10?;

2. Logic Descriptions

Logic descriptions include the three methods of describing a logic circuit. Two methods the Boolean equation and the Truth Table method already have been discussed.

3. Test Vectors

The Test Vector format has been described. The Test vector description is used to simulate the logic circuit and verify its operation.

Question 9: Why a 2-bit comparator is called parallel comparator?

Answer:

The 2-bit Comparator discussed earlier is considered to be a Parallel Comparator as all the bits are compared simultaneously. External Logic has to be used to Cascade together two such Comparators to form a 4-bit Comparator. (Page 154)

Question 10: Write a note on COMPARATOR

Answer:

COMPARATOR

A comparator circuit compares two numbers and sets one of its three outputs to 1 indicating the result of the comparison operation. A Comparator circuit has multiple inputs and three outputs.
A 2-bit Comparator circuit compares two 2-bit numbers A and B. The comparator circuit has three outputs. It sets the A>B output to 1 if A>B. It sets the A=B output to 1 if A=B and sets A<B output to 1 if A < B.
The output A>B is set to 1 when the input combinations are 01 00, 10 00, 10 01, 11 00, 11 01 and 11 10
The output A=B is set to 1 when the input combinations are 00 00, 01 01, 10 10 and 11 11