Osmania University (OU) 2006-1st Sem B.E Electronics & Tele-Communication Engineering 4/4 (E.C.E)(ESTER)SUPPLEMENTARY ,IL,DIGITAL DESIGN WITH HDL - Question Paper
faculty of engineering
B.E 4/4 (E.C.E)(I-SEMESTER)SUPPLEMENTARY EXAMINATION,APRIL,2006
DIGITAL DESIGN WITH HDL
Code No. 10462/N
FACULTY OF ENGINEERING B.E. 4/4 (ECE) (I-Semester) Supplementary Examination, April, 2006 DIGITAL DESIGN WITH HDL
Time: Three Hours] ~ [Maximum Maries: 75
Answer All questions of Part A.
Answer FIVE questions from Part B.
PARTA (Marks: 25)
1. What are the three basic description styles supported by verilog HDL ?
2. What are the two main data types in verilog HDL?
3. Name two swith-level modeling primitive gates.
4. What is the purpose of the time scale1 compiler directive ?
5. State two ways by which you can override a parameter value at compile time.
6. Declare a parameter GATE-DELAY with a value of 5.
7 . How is a combinational UDP different from a sequential UDP ?
8. When there are two or more assignments to the same target, how is the effective value for the target determined ?
9. When is a label required for a block?
10. How does the case x statement differ from case statement ?
PARTB (Marks: 5*10=50)
11. (a) What are the bit patterns for the following:
7'044, T3 x 0,5'bx 110, 'hAO, 10dz, hzf.
(b) Explain the text substitution directive using an example.
12. (a) What is the difference between a sequential block and a parallel block? Explain using an example.
Can a sequential block appear within aparallel block ?
(b) What is the difference between an intra statement delay and an inter statement delay ? Explain using an example.
BCD588 (Contd.)
13. (a) Write a function that converts a four-character string that contains only decimal digits to an integer
value. For example if My Buffer contains the string 4298", convert it to an integer Mylnt that has the value 4298.
(b) Write a task that dumps the contents of a memory starting from a specified begin and end locations.
14. (a) Write a VHDL model that generates the waveform shown in figure below:
0 2 5 io 15 16 17 22 23 27 30ns
(b) Describe an ALU that performs on the relational operations (<, > =, >, > =) on two 4-bit operands. Write a test bench that reads the test patterns and the expected result from a textile.
15. (a) Describe a D-type flip-flop using behavioural construct, then using this module, write a model for
a gbit register.
(b) Show how a disable statement can be used to emulate the behaviour of the continue and break statements of the C programming language.
16. (a) Describe the behaviour ofaJK flip-flop using an always statement.
(b) Write a user-defined primitive (UDP) description for die priority encoder circuit shown in figure below:
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17. (a) Write an expression that performs the arithmetic shift of a 8-bit signed number contained in Qparity. |
(b) Given a 32-bit bus, Address-Bus, write an expression that computer the reduction n and of bits 11 through 20.
BCD588 800
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| Earning: Approval pending. |
