Instruction Set Architecture

If a computer has a word length of 64 bits, how many ASCII-encoded characters can be stored in one word?

• 2

• 4

• 8

• 1

Machine instructions always need multiple words to represent themselves.

• True

• False

Mark all true statements about memory out of the following

• Each cell stores 0 or 1

• Computer memory is like a collection of words

• Dealt with in groups of fixed size

• A single, basic operation is executed on a group of n bits

When storing a signed integer in a single word, which one is the sign bit?

• The least significant bit

• The most significant bit

In little-endian assignment, lower byte addresses are assigned to

• the less significant bytes (the rightmost bytes) of the word

• the more significant bytes (the leftmost bytes) of the word

Mark all the correct statements about Complex Instruction Set Computer (CISC)

• The instructions may use more than one word of memory

• The instructions may represent complicated operations

• The approach is more recent than RISC

• Sequence of instructions are hard to pipeline

Which type of addressing mode is used in

Load R2, 1000(R5)

• Index mode

• Immediate mode

• Absolute mode

• Register mode

Which type of addressing mode is used in

Add R4, R6, #100

• Index mode

• Immediate mode

• Absolute mode

• Base with index mode

Which type of addressing mode is used in

Store R3, SUM

• Index mode

• Immediate mode

• Absolute mode

• Register indirect mode

A computer must have instructions capable of performing the following operations, except

• I/O transfer

• Data transfers between the memory and the processor registers

• Program sequencing and control

• Arithmetic and logic operations on data

• No exception (all four are necessary)