Chapter 7 From Computer Organization And Architecture

Front 1

Infiniband allows IO devices to be placed outside the server chassis, in some cases as much as 6 miles away

Back 1

true

Front 2

The DMA mechanisms can be configured in different ways, including

Back 2

-There is a single bus. The DMA module and each IO module are attached to the Bus
-Only the DMA module is attached to the bus. The IO modules are not attached to the bus, but rather, are attached to the DMA module
-The IO modules are attached to an IO bus with is attached to the DMA module which is attached to the system bus

Front 3

Reasons a peripheral device is not connected directly to the system bus, but rather to the system bus through an IO module include:

Back 3

-removes burden of logic from CPU
-devices are slower that mem or CPU
-devices can have high bandwidth requirements
-defferent peripherals can have different formats

Front 4

When using the DMA IO technique, there is a DMA module instead of an IO module

Back 4

False

Front 5

What are the 2 possible mode of addressing when the CPU, mem, and IO module share a common bus?

Back 5

-memory mapped
-isolated

Front 6

_____is the type of IO in which a program issues an IO request, and then continues to execute other instructions until it is informed by the IO hardware that the io operation is complete

Back 6

interrupt driven IO

Front 7

with isolated IO, there is an address space for mem and a separate address for devices. It is not the value of the address that determines if an address is a momory localtion or a device, rather a command line on the bus indicates whether the address is for a mem location or a device

Back 7

true

Front 8

vector means that a device places a unique ID on the data lines

Back 8

true

Front 9

what is the technique which IDs the interrupting device by means of a shared interrupt line?

Back 9

daisy chain

Front 10

usually external devices are connected to the computer via an IO module

Back 10

true

Front 11

what technique IDs the interrupting device by the following method. the IO module which wants to issue an interrupt gains control of the bus. when the CPU acks the interrupt, the IO module places its vector in the data lines

Back 11

bus arbitration

Front 12

infiniband is an IO spec aimed at the high end server market

Back 12

true

Front 13

firewire provides for auto config so that it isnt neccesary to mannually set device IDs, or to be concerned with the relative position of devices

Back 13

true

Front 14

on of the motivations for firewire is to provide a single IO interface with a simple connector that can handle numerous devices through a single port

Back 14

true

Front 15

in trying to ID which device issued an interrupt, one strategy is to use multiple interrupt lines and each device has its own line

Back 15

false

Front 16

isochronous transmission requires an ack from the reciever

Back 16

false

Front 17

when compenents operate at different speeds, a ____ is used to queue up data

Back 17

buffer

Front 18

an IO channel which controls multiple devices and can transfer data with several of these devices at a time is a

Back 18

multiplexor channel

Front 19

the computers IO subsystem us uts interface to the outside world

Back 19

true

Front 20

which is the common name for the IEEE standard for a high performance serial bus

Back 20

firewire

Front 21

___ is the type of IO in which the IO occurs under the direct and continous control of the program that is requesting the IO operation

Back 21

programmed I/o

Front 22

what is it called when the DMA module forces the CPU to suspend operation temporarily so that the DMA module can gain control of the bus?

Back 22

cycle stealing

Front 23

when multiple devices issue an interrupt, there must be some sort of prioritizing to ensure that the most important ones are handled first. which of the following is a technique for prioritizing?

Back 23

-multiple lines and each line has a priority
-in order devices are polled
-bus arbitration can employ a scheme

Front 24

firewire and infiniband are examples of external IO interfaces

Back 24

true

Front 25

in interrupt driven IO, since there can be multiple devices on each IO module, and since there can be multiple IO modules, how does the CPU determine which device issued the interrupt?

Back 25

-use multiple interrupt lines
-software polling
-daisy chain
-vectored bus arbitration

Front 26

when there is an IO request, the CPU is responsible for moving data between mem and the IO module

Back 26

false

Front 27

an IO module interfaces between the computer and one or more peripheral devices. the IO module may vary in complexity. what is the lowest level IO module called?

Back 27

i/o controller

Front 28

IO controllers are common on mainframes

Back 28

false

Front 29

mem and peripherals operate at differnt speeds. the io module must be able to operate at both speeds

Back 29

true

Front 30

in an IO module, the ___ converts data from electrical to other forms of energy

Back 30

transducer

Front 31

ID the principle IO techniques

Back 31

-programmed io
-interrupt driven io
-DMA

Front 32

an io channel which controls multiple hi speed devices and is dedicated to the transfer of data is called a

Back 32

selector channel

Front 33

isochronous and asynchronous transmissions can happen on the same line

Back 33

true

Front 34

the major disadvantage of ptogrammed io is that it keeps the CPU busy

Back 34

true

Front 35

if there are 8 bits for addressing, in memory mapped IO that is the total number of locations?

Back 35

256

Front 36

an IO module is which of the following

Back 36

-interfaces to the system bus
-controls one or more peripherals
-physically connects to the comm medium
-contains logic for performing comm between bus and peripheral

Front 37

which of the following IO requires the most of the CPU

Back 37

programmed io

Front 38

which of the following are characteristics of firewire?

Back 38

-hi speed
-low cost
-easy to implement
-used in consumer market
-serial transmission
-hot plugging

Front 39

_is the type of io in which a specialized IO proccessor takes over control of an IO operation to move a large block of data

Back 39

DMA

Front 40

how many locations can be mapped in isolated IO with 8 bits?

Back 40

512

Front 41

the node responsible for coordinating the switch between asynchronous and isochronous transmission is the

Back 41

cycle master

Front 42

interrupt driven io is more efficient, but every byte transferred must be passed through the CPU

Back 42

true

Front 43

fair arbitration divides time into fairness intervals. once a device has the bus, it cannot request the bus diring the same fairness intervak

Back 43

true

Front 44

the transmission mode that provides a variable amount of data to be transferred in a sequence of fixed size packets is called

Back 44

isochronous

Front 45

each IO device has an address

Back 45

true

Front 46

software polling is more efficiant that daisy chaining

Back 46

false

Front 47

which IO techniques requires the least CPU

Back 47

DMA

Front 48

firewire was developed as a low cost alternative to more expensive io channels for large computers

Back 48

true

Front 49

io channels are common on microcomputers

Back 49

false

Front 50

an io module performs error detection with hamming code

Back 50

false

Front 51

infiniband is designed for comm between cpu and intelligent devices and is intended to replace pci

Back 51

true

Front 52

by daisy chaining, firewire can connect up to 200 devices

Back 52

false

Front 53

the ability to plug and unplug devices without powering down is called

Back 53

hot plugging

Front 54

with mem mapped io, there is a single address space for mem locations and io devices.

Back 54

true

Front 55

when trying to ID which device has issued an interrupt, what is the technique ised to query each IO module to find out which module issued the interrupt?

Back 55

software polling

Front 56

dma is the most appropriate io technique when large volumes of data need to be moves

Back 56

true

Front 57

a multiplexor channel dedicated to hi speed devices is called a

Back 57

block multiplexor

Front 58

firewire and infiniband are important point to point interfaces

Back 58

false

Front 59

firewire can support more peripherals than can practically be needed since as many as 1022 buses can be interconnected

Back 59

true

Front 60

a multiplexor channel dedicated to slow speed devices is called a

Back 60

byte multiplexor

Front 61

the disadvantage of software polling is that it is time consuming

Back 61

true

Front 62

an io module interfaces between the computer and one ore more peripheral devices. the most high level io module is called a

Back 62

i/o channel

Front 63

since the bottlenecks in a computer is the IO, parralell interfaces are becoming more common

Back 63

false

Front 64

_____allows for effective multiprogramming. it creates the illusion that there is more memory than there really is

Back 64

virtual memory

Front 65

a special cache devoted specifically to storing page frams is called a

Back 65

transition lookaside buffer

Front 66

reasons a program may cause an interrupt to occur include

Back 66

-program produced an error
-timeout

Front 67

with variable sized partitions

Back 67

-the exact amount of mem required can be allocated
-more efficient that fixed
-can still waste space due to fragmentation

Front 68

the data structure an os creates to store info about a process is called a

Back 68

process control block

Front 69

when using fixed partitions, each partition is the same size

Back 69

false

Front 70

the CPU can cease to execute a program and begin executing instructions from the OS ofr the folloowing reasons

Back 70

-program issues a request to the os
-program causes an interrupt
-another interrupt happens

Front 71

when a job is admitted for processing, it becomes a process

Back 71

true

Front 72

the key to multiprogramming is scheduling

Back 72

true

Front 73

the mom management technique of dividing mem into small equal sized partitions is called

Back 73

paging

Front 74

what is it called when a program references an instruction or data not in mem?

Back 74

page fault

Front 75

which type of scheduling deals with jobs that are swapped out?

Back 75

medium term

Front 76

in paging, a process can be allocated potentially many non contigous page frams. a page table is maintained for each process to keep track of page frams

Back 76

true

Front 77

with demand paging, the technique of replaceing an idle process that is not in the ready queue with another process is called

Back 77

swapping

Front 78

a technique for overcoming wasted space due to fragmentation by compressing holes is

Back 78

compaction

Front 79

relative to other types of scheduling, the short term scheduler executes frequently

Back 79

true

Front 80

simplest scheme for partitioning is fixed size

Back 80

true

Front 81

the task of subdiviing mem to accomidate multiple process is called

Back 81

memory management

Front 82

the long term scheduler determines which programs are addmitted to the ready queue and thus controls the degree of multi programming

Back 82

true

Front 83

the technique of bringing in a page of a process only when needed is called

Back 83

demand paging

Front 84

the goal of mem management is to keep the CPU busy

Back 84

true

Front 85

short term scheduler is also known as

Back 85

dispatcher

Front 86

the long term scheduler executes very frequently

Back 86

false

Front 87

segmentation is another was in which addressable mem can be divided. unlike paging, segmentation is visible to the programms. segmentation alllwos the programmer to view memory as consisting of multiple address spaces or segments

Back 87

true