VHDL Practice Test 7

1. The attribute s’TRANSACTION creates a signal of type ______

INTEGER

BOOLEAN

Same as signal s

BIT

2. The formula for T’LENGTH is best described by which of the following?

T’HIGH – T’LOW

T’HIGH + T’LOW

T’HIGH + T’LOW - 1

T’HIGH - T’LOW + 1

3. A procedure is called concurrently. It will execute when ________

Any of its IN or INOUT parameter change

Any of its OUT parameters change

Any of its parameters change

Any of its IN parameters change

4. Which of the following returns the Boolean type always?

‘LAST_EVENT

‘LAST_VALUE

‘EVENT

‘STABLE

5. What will be the value of array16’RANGE and array16’REVERSE_RANGE, if the array16 is an object defined as below?

TYPE array16 IS ARRAY(15 DOWNTO 0) OF BIT

15 DOWNTO 0, 0 TO 15

0 TO 15, 15 DOWNTO 0

0 TO 15, 0 TO 15

15 DOWNTO 0, 15 DOWNTO 0

6. In which of the following case, the code will not be synthesizable?

Code containing a CASE statement inside a function

Code containing a WAIT statement inside a procedure

Code containing a WAIT statement inside a process

Code containing a RETURN statement inside a function

7. A user is encountering some error with his design, among which of the following the debugging must be easy?

In a code containing both functions as well as procedures

In a code containing procedures but no functions

In a code containing no functions or procedures

In a code containing functions but no procedures

8. Which of the following is returned by the function kind attributes?

Function

Signal

Array

Value

9. Which of the following describes the function of ‘PRED(value)?

To return the position of value next to the value passed in argument

To return the value next to the value passed in argument of the attribute

To return the value previous to the value passed in the argument

To return the position of value next to the value passed in argument

10. In which of the following cases, the procedure can’t contain WAIT statement?

When called from a LOOP statement

When called from inside a process

When called from inside a process with a sensitivity list

When called from architecture