Title 3140707 - COA 2021W.pdf ✅

1 Seat No.: ________ Enrolment No.___________ GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–IV (NEW) EXAMINATION – WINTER 2021 Subject Code:3140707 Date:03/01/2022 Subject Name:Computer Organization & Architecture Time:10:30 AM TO 01:00 PM Total Marks: 70 Instructions: 1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks. 4. Simple and non-programmable scientific calculators are allowed. Marks Q.1 (a) Explain three state buffers. 03 (b) Describe BUN and BSA memory reference instructions in detail. 04 (c) What is interrupt? Describe interrupt cycle with neat diagram. 07 Q.2 (a) Differentiate assembly language and machine language. 03 (b) What is the need of common bus? Draw common bus cycle. 04 (c) Write an assembly language program to find whether the given number is prime or not. 07 OR (c) Write an assembly language program to find factorial of the given number. Q.3 (a) Define followings: 1. Control Memory 2. Control Word 3. Control Address Register 03 (b) Draw the flowchart of first pass of the assembler and explain working of the same. 04 (c) What is the significance of pipelining in computer architecture? Write a note on instruction pipeline. 07 OR Q.3 (a) What is address sequencing? Explain. 03 (b) Construct a 4-bit adder-subtractor circuit. 04 (c) What addressing mode means? Explain any three addressing modes in detail with example. 07 Q.4 (a) Enlist the characteristics of RISC. 03 (b) Write a program to evaluate X = (a*b)/c+d in two address and three address instruction formats. 04 (c) Draw neat and clean flowchart for divide operation. Explain with example. 07 OR Q.4 (a) Differentiate isolated I/O and memory mapped I/O. 03 (b) Describe pipeline conflicts. 04 (c) What is cache memory address mapping? Compare and contrast direct address mapping and set-associative address mapping. 07 Q.5 (a) What is the importance of virtual memory? 03 (b) Explain multiport memory and crossbar switch with reference to interconnection structures in multiprocessors. 04