Deck 13: Addressing Modes and Formats

Question 1

The method of calculating the EA is the same for both base-register addressing and indexing.

Answer 1

True

Question 2

In a system without virtual memory,the effective address is a virtual address or a register.

Answer 2

False

Question 3

With direct addressing,the length of the address field is usually less than the word length,thus limiting the address range.

Answer 3

True

Question 4

The principal advantage of ___________ addressing is that it is a very simple form of addressing.

A)displacement
B)register
C)stack
D)direct

Question 5

The memory transfer rate has not kept up with increases in processor speed.

Question 6

Register addressing is similar to direct addressing with the only difference being that the address field refers to a register rather than a main memory address.

Question 7

The principal price to pay for variable-length instructions is an increase in the complexity of the processor.

Question 8

__________ has the advantage of flexibility,but the disadvantage of complexity.

A)Stack addressing
B)Displacement addressing
C)Direct addressing
D)Register addressing

Question 9

The base with index and displacement mode sums the contents of the base register,the index register,and a displacement to form the effective address.

Question 10

Register indirect addressing uses the same number of memory references as indirect addressing.

Question 11

The value of the mode field determines which addressing mode is to be used.

Question 12

One advantage of linking the addressing mode to the operand rather than the opcode is that any addressing mode can be used with any opcode.

Question 13

Typically an instruction set will include both preindexing and postindexing.

Question 14

Three of the most common uses of stack addressing are relative addressing,base-register addressing,and indexing.

Question 15

The advantage of __________ is that no memory reference other than the instruction fetch is required to obtain the operand.

A)direct addressing
B)immediate addressing
C)register addressing
D)stack addressing

Question 16

The disadvantage of immediate addressing is that the size of the number is restricted to the size of the address field.

Question 17

The advantages of _________ addressing are that only a small address field is needed in the instruction and no time-consuming memory references are required.

A)direct
B)indirect
C)register
D)displacement

Question 18

For addresses that reference memory the range of addresses that can be referenced is not related to the number of address bits.

Question 19

__________ has the advantage of large address space,however it has the disadvantage of multiple memory references.

A)Indirect addressing
B)Direct addressing
C)Immediate addressing
D)Stack addressing

Question 20

The x86 is equipped with a variety of addressing modes intended to allow the efficient execution of high-level languages.

Question 21

For the _________ mode,the operand is included in the instruction.

A)immediate
B)base
C)register
D)displacement

Question 22

_________ is a principle by which two variables are independent of each other.

A)Opcode
B)Orthogonality
C)Completeness
D)Autoindexing

Question 23

Which of the following interrelated factors go into determining the use of the addressing bits?

A)number of operands
B)number of register sets
C)address range
D)all of the above

Question 24

Not common on contemporary architectures,___________ requires only one memory reference and no special calculation,but provides only a limited address space.

Question 25

Sometimes referred to as a pushdown list or last-in-first-out queue,a __________ is a linear array of locations.

Question 26

The _________ was designed to provide a powerful and flexible instruction set within the constraints of a 16-bit minicomputer.

A)PDP-1
B)PDP-8
C)PDP-11
D)PDP-10

Question 27

__________ is a design principle employed in designing the PDP-10 instruction set.

A)Orthogonality
B)Completeness
C)Direct addressing
D)All of the above

Question 28

For _________,the address field references a main memory address and the referenced register contains a positive displacement from that address.

A)indexing
B)base-register addressing
C)relative addressing
D)all of the above

Question 29

Just as register addressing is analogous to direct addressing,________ addressing is analogous to indirect addressing.

Question 30

The simplest form of addressing is __________ addressing.

Question 31

The __________ byte consists of three fields: the Scale field,the Index field and the Base field.

A)SIB
B)VAX
C)PDP-11
D)ModR / M

Question 32

The only form of addressing for branch instructions is _________ addressing.

A)register
B)relative
C)base
D)immediate

Question 33

All instructions in the ARM architecture are __________ bits long and follow a regular format.

A)8
B)16
C)32
D)64

Question 34

The actual mapping to a physical address is a function of the _________ and is invisible to the programmer.

Question 35

A very powerful mode of addressing,__________ combines the capabilities of direct addressing and register indirect addressing,requiring that the instruction have two address fields,at least one of which is explicit.

Question 36

__________ is when the increment or decrement of the index register after each reference to it is done automatically as part of the same instruction cycle.

Question 37

In the __________ mode the instruction includes a displacement to be added to a base register,which may be any of the general-purpose registers.

Question 38

Indexing performed after the indirection is __________.

A)relative addressing
B)autoindexing
C)postindexing
D)preindexing

Question 39

"All instructions should have the 'natural' number of operands" and "all operands should have the same generality in specification" are two criteria that were used in designing the __________ instruction format.

Question 40

A(n)__________ defines the layout of the bits of an instruction in terms of its constituent fields,must include an opcode and,implicitly or explicitly,zero or more operands.

Question 41

If a programmer wished to program directly in machine language it would be necessary to enter the program as ________ data.

Question 42

Programs written in assembly language are translated into machine language by an _________.

Question 43

__________ explicitly specifies which segment register an instruction should use,overriding the default segment-register selection generated by the x86 for that instruction.

Question 44

The __________ instruction set is designed to increase the performance of ARM implementations that use a 16-bit or narrower memory data bus and to allow better code density than provided by the ARM instruction set.

Question 45

The _________ byte specifies whether an operand is in a register or in memory,and if it is in memory,then fields within the byte specify the addressing mode to be used.