CS6303 Computer Architecture

CS6303 Computer Architecture Nov/Dec 2016 Anna University Question Paper

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Department of Computer Science and Engineering

Sub. Name: Computer Architecture                                   Sub.Code: CS6303

Max.Marks: 100                                                                     Time: 180 min

Department: Computer Science and Engineering             Sem/Year: III/II       Date:

Model Exam – I

PART – A                              10x 2=20

1.        What is RISC and CISC?                                                                        (CO1)

The architectural designs of CPU are RISC (Reduced instruction set computing) and CISC (Complex instruction set computing). CISC has the ability to execute addressing modes or multi-step operations within one instruction set. It is the design of the CPU where one instruction performs many low-level operations

2.        List out the methods used to improve system performance.                    (CO1)

The time to execute a program is a function of the number of instructions to execute, the average number of clock cycles required per instruction, and the clock cycle time:

3.        Write the rules for add/sub operation on floating point numbers.            (CO2)

In a computer, there is a tradeoff between range and precision - given a fixed number of binary digits (bits), precision can vary inversely with range. In this section, we overview decimal to FP conversion, MIPS FP instructions, and how registers are used for FP computations.

4.        Define Truncation.                                                                                  (CO2)

Truncation of positive real numbers can be done using the floor function. Given a number {\displaystyle x\in \mathbb {R} _{+}} to be truncated and {\displaystyle n\in \mathbb {N} _{0}}, the number of elements to be kept behind the decimal point, the truncated value of x is

{\displaystyle \operatorname {trunc} (x,n)={\frac {\lfloor 10^{n}\cdot x\rfloor }{10^{n}}}.}

5.        Define structural hazards.                                                                        (CO3)

For example, a structural hazard would occur if a processor tried to use the same memory port for both instructions and data. Structural hazards commonly are overcome by pipeliningMIPS instruction sets.

6.        What is branch folding?                                                                          (CO3)

Branch folding is a technique where, on the prediction of mostbranches, the branch instruction is completely removed from the instruction stream presented to the execution pipeline. 

7.        Define Strong scaling and weak scaling.                                                 (CO4)

The first is strong scaling, which is defined as how the solution time varies with the number of processors for a fixed total problem size. The second is weak scaling, which is defined as how the solution time varies with the number of processors for a fixed problem size per processor.

8.        Define multithreading.                                                                             (CO4)

In computer architecture, multithreading is the ability of a central processing unit (CPU) or a single core in a multi-core processor to execute multiple processes or threads concurrently, appropriately supported by the operating system.

9.        Define virtual memory.                                                                           (CO5)

In computing, virtual memory is a memory management technique that is implemented using both hardware and software. It maps memory addresses used by a program, called virtual addresses, into physical addresses in computer memory.

10.     What is SCSI?                                                                                         (CO5)

The Small Computer System Interface (SCSI) is a set of parallel interface standards developed by the American National Standards Institute (ANSI) for attaching printers, disk drives, scanners and other peripherals to computers. SCSI (pronounced "skuzzy") is supported by all major operating systems.

PART – B                                              13 x 5=65

11.a. Explain in detail about the eight ideas of computer architecture.                     (CO1)

Or

11.b. What are the various logical operations and explain the instructions supporting the logical operations                                                                                                          (CO1)(6+7)

12.a. Give the block diagram for a adder and revised  and discuss its operation. (CO2)

Or

12.b. Explain the Booth’s algorithm for multiplication of signed two’s complement numbers                                                                                                                               (CO2)

13 a. Briefly explain the speedup performance models for pipelining                     (CO3)

Or

13.b. Explain the data path and control consideration of a pipeline organization and explain                                                                                                                  (CO3)

14.a. Explain MISD and MIMD with an example                                                  (CO4)(6+7)

Or

14.b. Explain challenges in parallel processing.                                                      (CO4)

15.a. What is an interrupt? Explain the different types of interrupts and the different ways of handling the interrupts                                                                                           (CO5)(4+9)

Or

15.b. Write short note on I/O processor. Describe the functions of SCSI interface with a neat diagram                                                                                                                 (CO5)(5+8)

Part C                                                                                     1 x 15=15

16. Explain details about the operation used in windows 64 bit system. (CO2)

Or

16. Explain details about the Instruction architecture used in graphical system(CO3)