VHDL Questions and Answers – Procedures – 2

This set of VHDL Questions and Answers for Aptitude test focuses on “Procedures – 2”.

1. Which of the following is not similar in both functions as well as procedures?
a) One can’t declare signals in functions as well as procedures
b) One can’t declare components in functions and procedures
c) In both, the WAIT statement is not synthesizable
d) Both can be declared inside a package
View Answer

2. The mode and class of the following parameters are respectively ________

my_procedure( SIGNAL a : IN INTEGER; b : OUT INTEGER; c : BIT);

a) IN, SIGNAL; OUT, SIGNAL; IN, CONSTANT
b) IN, SIGNAL; OUT, CONSTANT; IN, VARIABLE
c) IN, SIGNAL; OUT, VARIABLE; IN, CONSTANT
d) IN, SIGNAL; OUT, CONSTANT; OUT, CONSTANT
View Answer

3. Which of the following is true about both functions and procedures?
a) WAIT statement can’t be used
b) When declared in a package, both require package body
c) SIGNALs can’t be declared
d) RETURN is used in both
View Answer

4. A user is encountering some error with his design, among which of the following the debugging must be easy?
a) In a code containing no functions or procedures
b) In a code containing functions but no procedures
c) In a code containing procedures but no functions
d) In a code containing both functions as well as procedures
View Answer

5. A procedure is called concurrently. It will execute when ________
a) Any of its parameters change
b) Any of its OUT parameters change
c) Any of its IN parameters change
d) Any of its IN or INOUT parameter change
View Answer

6. In which of the following cases, the procedure can’t contain WAIT statement?
a) When called from inside a process
b) When called from inside a process with a sensitivity list
c) When called from architecture
d) When called from a LOOP statement
View Answer

7. A procedure can have a label in front of it.
a) True
b) False
View Answer

8. In which of the following case, the code will not be synthesizable?
a) Code containing a WAIT statement inside a process
b) Code containing a WAIT statement inside a procedure
c) Code containing a RETURN statement inside a function
d) Code containing a CASE statement inside a function
View Answer

9. Which of the following may be specified by the code given?

TYPE op_code is ( ADD, SUB, MUL, DIV, LT, LE, EQ );
PROCEDURE first_unit ( A, B : in integer; op : in op_code;
Z : out integer; ZCOMP : out boolean ) is
BEGIN
CASE op IS
WHEN ADD => Z := A + B;
WHEN SUB => Z := A - B;
WHEN MUL => Z := A * B;
WHEN DIV => Z := A / B;
WHEN LT =&gt; ZCOMP := A < B;
WHEN LE =&gt; ZCOMP := A <= B;
WHEN EQ =&gt; ZCOMP := A = B;
WHEN others =&gt; Z := Z;
END case;
END first_unit;

a) CPU
b) CU
c) ALU
d) Memory
View Answer

10. How many types of the output are returned by the code given?

TYPE op_code is ( ADD, SUB, MUL, DIV, LT, LE, EQ );
PROCEDURE first_unit ( A, B : in integer; op : in op_code;
Z : out integer; ZCOMP : out boolean ) is
BEGIN
CASE op IS
WHEN ADD => Z := A + B;
WHEN SUB => Z := A - B;
WHEN MUL => Z := A * B;
WHEN DIV => Z := A / B;
WHEN LT =&gt; ZCOMP := A < B;
WHEN LE =&gt; ZCOMP := A <= B;
WHEN EQ =&gt; ZCOMP := A = B;
WHEN others =&gt; Z := Z;
END case;
END first_unit;

a) 0
b) 1
c) 2
d) 3
View Answer

Sanfoundry Global Education & Learning Series – VHDL.

To practice all areas of VHDL for Aptitude test, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]