VHDL Practice Test 6

1. When there is no delay specified in a signal assignment (concurrent), the delay will be _______

Inertial delay

Transport delay

Zero

Delta delay

2. A variable can be used outside the process i.e. in the architecture.

False

True

3. Procedures are useful when _________

Signals are needed to be declare

Functions are not synthesizable

Multiple values are needed as a result

Architecture can’t contain some statement

4. It is possible to include another package in a package.

False

True

5. Which of the following is the correct syntax to declare a package?

     PACKAGE package_name IS
     declarations;
     END package_name;
     PACKAGE BODY package_name IS
     Functions and procedures descriptions;
     END package_name;

     PACKAGE package_name IS
     declarations;
     PACKAGE BODY package_body_name IS
     Functions and procedures descriptions;
     END package_name;

     PACKAGE package_name IS
     declarations;
     END package_name;
     PACKAGE BODY package_body_name IS
     Functions and procedures descriptions;
     END package_name;

     PACKAGE package_name IS
     declarations;
     PACKAGE BODY package_name IS
     Functions and procedures descriptions;
     END package_name;

6. What is there in right hand side of a variable assignment?

Waveform elements

Delays

Time expressions

Simple expressions

7. The basic arithmetic function provided by STD_LOGIC_ARITH is for ______ data type.

STD_LOGIC

INTEGER

STD_LOGIC_VECTOR

CHARACTER

8. What is the use of resolution functions?

Return the value of a signal with multiple drivers

Resolve value of a constant with multiple drivers

Convert one data type into another

Convert one data object into another

9. Which of the following sequential statement can’t be used in a function?

WAIT

LOOP

CASE

10. Conversion functions are used to _________

Convert one data type into another

Convert one data object into another

Resolve value of a signal with multiple drivers

Resolve value of a constant with multiple drivers