April 2000
CS202 : COMPUTER ARCHITECTURE AND DATA COMMUNICATIONS

QUESTION 5

Total Marks: 15 Marks

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SUGGESTED SOLUTIONS
for Question 5

(a)In most processor designs,the format of a typical instruction comprises of an opcode and an operand.The operand is also known as an address field
Explain in detail the purpose and content of the address .eld.[6 marks ]

(b)Most instructions fall in one of three types of organisation.Ex lain in detail each of these different types of instruction formats:
(i)Single accumulator organisation.[2 marks ]
(ii)Multiple register organisation.[2 marks ]
(iii)Stack organisation.[2 marks ]

(c)Given below is an equivalent register transfer statement for each instruction in a 3-address format.From the statements below work out the corresponding program and hence or otherwise,write down the expression which is calculated.
R1 M[A] +M[B]
R2 M[C] +M[D]
M[X ] R *R
[3 marks ]