CS501 Advance Computer Architecture final term paper 2011 imported question

[Vuhelper]

CS501 - Advance Computer Architecture
Final paper 8/11/10
Q1) suppose an I/O system with a single disk gets (on average) 200 I/O request/second. Assume that average time for a disk to service an I/O request is 4ms. What is the utilization time? 3Marks
Q2) Give an example when DMA can be brought into use? 3Marks
Q3) convert the hexadecimal number B316 to base 10 5Marks
Welcome to vuZs
Q4) Does DMA affects the relationship b/w the memory system and CPU system. Explain with example.
5Marks
Q5) consider a 128kb direct mapping with a line length of 32 bytes
I. Determine the number of bits in the address that refers to the bytes within the cache
I. 
Q6) consider the following floating point’s numbers 3 marks
-0.5 X 10-3
Find out the sign, significant and exponent
Q7) why we represent sometime some numbers in sign magnitude form.

[Vuhelper]

[SIZE="5"][SIZE="5"]full solution in attachment [/SIZE][/SIZE]

Name different instruction format types of SRC “simple RISC computer”? Compare each type for the following features only:
a) Number of instructions
b) Addressing mode

Yours answer should be to the point and cover all the necessary details as asked in the question.

Solution

Four types of instructions are supported by the SRC
Type A
Type A is used for only two instructions:

Number of instructions
Addressing mode

Two instructions

• No operation or nop
• Stop operation stop

Both of these instructions do not need an operand (are 0-operand instructions).

Type B
Number of instructions
Addressing mode
Type B format includes three instructions; all three use relative addressing mode
• ldr instruction, used to load register from memory using a relative address
• The lar instruction, for loading a register with relative address
• The str is used to store register to memory using relative address


The effective address is computed at run-time by adding a constant to the PC. This makes the instructions ‘re-locatable’.