Deck 12: Memory Devices

Question 1

How many address bits would be required for a memory that stores 64, 4- bit words?

A) 6
B) 4
C) 2
D) 8

Answer 1

6

Question 2

Which of the following are the four basic parts of ROM architecture?

A) Row decoder, column decoder, register array, and output buffer
B) Input buffer, output buffer, register array, and row decoder
C) Digital- to- analog converter, row decoder, column decoder, and output buffer
D) Row decoder, register array, binary up- counter, and output buffer

Answer 2

Row decoder, column decoder, register array, and output buffer

Question 3

Which of the following is an advantage that an EEPROM has over an EPROM?

A) The EEPROM can be erased with ultraviolet light in much less time than an EPROM.
B) The EEPROM can be erased and reprogrammed without removal from the circuit.
C) The EEPROM has the ability to erase and reprogram individual words.
D) The EEPROM may be reprogrammed much faster than an EPROM but it must be removed from the circuit.
E) Both B and C

Answer 3

Both B and C

Question 4

Capacity, when used to define memory devices, normally refers to the number of:

A) memory words that may be stored in a designated memory device.
B) bits that may be stored in a designated memory device.
C) nibbles that may be stored in a designated memory device.
D) bytes that may be stored in a designated memory device.

Question 5

A computer's internal memory consists of:

A) mass memory.
B) semiconductor devices.
C) static memory devices.
D) Both B and C

Question 6

How many address lines would be required for a 4 K × 4 memory?

A) 10
B) 12
C) 13
D) 14

Question 7

Which of the following are normally used to initialize a computer system's hardware?

A) Static memory
B) External mass memory
C) Volatile memory
D) Bootstrap memory

Question 8

Which of the following terms best describes Read- Only- Memory (ROM)?

A) Volatile, used to store information that does not change during system operation
B) Volatile, used to store information that changes during system operation
C) Nonvolatile, used to store information that does not change during system operation
D) Nonvolatile, used to store information that changes during system operation

Question 9

Of the following memory devices, which two would store the same number of bits?
1. 1024 K × 8
2.1M*10
3.2M*4
4.1M*4

A) 1 and 2
B) 1 and 3
C) 1 and 4
D) 2 and 3
E) None of the above

Question 10

A major disadvantage of the Mask- Programmed ROM (MROM) is that it:

A) cannot be reprogrammed if the stored data needs to be changed.
B) has an extremely short life expectancy and requires frequent replacement.
C) is very expensive to change the stored data when system requirements change.
D) is time consuming to change the stored data when system requirements change.

Question 11

How many bits of information could normally be stored in a memory device with a capacity of 256 K?

A) 262,144
B) 204,800
C) 256,000
D) 2,097,152

Question 12

Suppose that a computer system has a read/write line identified as https://d2lvgg3v3hfg70.cloudfront.net/TB9839/. When writing to memory:

A) write = 0, and the data presently stored in the designated memory location would be written to a new memory location.
B) write = 0, and the data presently stored in the designated memory location would be lost as the new data is written.
C) write = 1, and the data presently stored in the designated memory location would be lost as the new data is written.
D) write = 1, and the data presently stored in the designated memory location would be written to a new memory location.

Question 13

Most ROM ICs have tri- state outputs that:

A) allow for three separate data input lines.
B) isolate the registers from the data bus during read operations.
C) allow the bidirectional flow of data between the bus lines and the ROM registers.
D) permit the connection of many ROM chips to a common data bus.

Question 14

Which of the following is used to erase an EPROM?

A) Fusible- links
B) Photographic negatives
C) Voltage pulses
D) Ultraviolet light

Question 15

Which of the following best describes Random Access Memory (RAM)?

A) A type of memory in which access time is the same for each memory location
B) A type of memory in which access time depends on memory location
C) A type of memory that can be written into only once but can be read from an infinite number of times
D) Mass memory

Question 16

How many bytes can be stored in an 8K × 8 memory chip?

A) 8,000
B) 64,000
C) 65,536
D) 8,192

Question 17

How many data outputs are required for a 64 × 8 memory chip?

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

Question 18

The delay between the application of an address to a ROM and the appearance of valid data at its outputs is called:

A) t_PHL.
B) access time, t_acc.
C) output enable time, t_OE.
D) t_PLH.

Question 19

Data that is stored in ROM is often referred to as:

A) shareware.
B) hardware.
C) firmware.
D) software.

Question 20

Which of the following best describes volatile memory?

A) Memory that retains stored information when electrical power is removed
B) Magnetic memory
C) Nonmagnetic memory
D) Memory that loses stored information when electrical power is removed

Question 21

Which of the following best describes static memory devices?

A) Semiconductor memory devices in which stored data will not be retained with the power applied unless constantly "refreshed"
B) Semiconductor memory devices in which stored data is retained as long as power is applied
C) Memory devices that are magnetic in nature that require constant "refreshing"
D) Memory devices that are magnetic in nature that do not require constant "refreshing"

Question 22

Which of the following is a bidirectional bus?

A) Data bus
B) Address bus
C) Control bus
D) Both A and B

Question 23

Which of the following memory devices comes with a window?

A) EPROM
B) ROM
C) MROM
D) RAM

Question 24

How many 1 K × 4 chips would be required to produce an 8 K × 16 module?

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

Question 25

How many address lines would be required for an 8K × 16 module?

A) 14
B) 12
C) 15
D) 13

Question 26

Which of these RAM timing parameters determine(s) its operating speed?

A) t_ACC
B) t_CO and t_OD
C) t_ACC and t_CO
D) t_RC and t_WC

Question 27

Which of the following signals performs the chip- select function for a DRAM memory with address multiplexing?

A)
B)
C)
D)

Question 28

The main advantage of semiconductor RAM is its ability to:

A) retain stored data when power is interrupted or turned off.
B) be written into and read from rapidly.
C) be randomly accessed.
D) be sequentially accessed.

Question 29

Which of the following memories are sequential- access devices?

A) Cache
B) FIFO
C) RAM
D) Power- down storage

Question 30

Which of the following memories uses a MOS capacitor as its memory cell?

A) SRAM
B) ROM
C) DRAM
D) Both A and B

Question 31

What part of a Flash memory architecture manages all chip functions?

A) I/O pins
B) Program verify command
C) Command register
D) Command code

Question 32

Which of the following is NOT a characteristic of Flash memory?

A) more expensive than EEPROM
B) in circuit erasure
C) erase faster than EPROM
D) electrically erasable

Question 33

Which type of memory cell would normally be associated with a "sense" amplifier?

A) ROM
B) SRAM
C) DRAM
D) Both A and C

Question 34

What is the principal advantage of using address multiplexing with DRAM memory?

A) Reduced memory access time
B) Reduced pin count and a decrease in package size
C) Eliminates the requirement for a chip- select input line thereby reducing the pin count
D) Reduced requirement for constant refreshing of the memory contents

Question 35

In high speed computer systems, which type of memory communicates directly with the microprocessor?

A) Flash
B) Cache
C) FIFO
D) Power- down storage

Question 36

The refresh method used with DRAM that allows for interspersed normal operation is called:

A) burst refresh.
B) shared refresh.
C) incremental refresh.
D) distributed refresh.

Question 37

What two functions does a DRAM controller perform?

A) Data selection and CPU accessing
B) Data selection and the refresh operation
C) Address multiplexing and data selection
D) Address multiplexing and the refresh operation

Question 38

Computer main memory is made up of RAM and ROM ICs that are interfaced to the CPU over three groups of signal line or buses comprising:

A) data, control, and address bus.
B) memory, power, and control bus.
C) logic, control, and disable bus.
D) data, ALC, and memory bus.

Question 39

Which of the following lists memory devices from the most complex and expensive, to the least complex and expensive?

A) EEPROM, PROM, Flash, and EPROM
B) Flash, EPROM, EEPROM,and PROM
C) EEPROM, Flash, EPROM, and PROM
D) PROM, Flash, EEPROM,and EPROM

Question 40

EEPROMs are nonvolatile, offer fast read access, and allow rapid in- circuit erasure and reprogramming of individual bytes. Compared to EPROMs, however:

A) EEPROMs suffer from lower density and much higher cost.
B) EEPROMs require much more power and thus must dissipate much more heat.
C) EEPROMs require UV light to reprogram.
D) EEPROMs are not adaptable to most CPUs.

Question 41

To set up a flash memory chip for read operations:

A) it is necessary first to write all 1^st into the command register.
B) it is necessary first to write all zeros into the command register.
C) data must be applied to data bus.
D) output enable must be disabled.

Question 42

The coating on CDR discs is permanently altered when the write laser hits it.

Question 43

Data storage on an optical disc is from the outside of the disc to the inside.

Question 44

The data bus is a unidirectional bus.

Question 45

An erasable Programmable ROM (EPROM) is programmed by the user and may be erased and reprogrammed as often as required.

Question 46

Testing ROM for proper operation is normally more complex than testing RAM.

Question 47

A write operation may also be referred to as a "fetch" operation.

Question 48

A ROM IC chip normally has a read/write control input.

Question 49

The "checkerboard" test is normally used to test RAM to determine its ability to store and read 1s and 0s.

Question 50

Flash memory can be used in place of a disk drive in a laptop computer.

Question 51

When writing data into a SRAM it is necessary to have valid data on the inputs after deactivating the chip and the write command.

Question 52

An advantage of DRAM over SRAM is its high speed.

Question 53

A data bit in a DRAM cell is refreshed each time it is read.

Question 54

A burst refresh and normal memory operation of a DRAM can be interspersed.

Question 55

A 16 K × 8 memory module can be made from four 8 K × 1 chips.

Question 56

DRAM chips can be combined for larger capacity and word sizes using the same methods as for other memory types.

Question 57

Flash memory devices use command codes to control internal operations.

Question 58

Erasing or programming a flash memory device is a one step operation.

Question 59

FIFO memory is true random access.

Question 60

Cache memory is used in high speed systems.

Question 61

If a RAM passes the checkerboard test it is probably good.

Question 62

FF registers are high- speed memory elements that are used extensively in the internal operations of a digital computer.

Question 63

Auxiliary memory, like CDs, stores massive amounts of data.

Question 64

Every data word, in every computer regardless of size, has an address code.

Question 65

Memory enable, chip enable, and chip select are terms used to describe a memory function that will completely disable all or part of the memory so that it will not respond to other inputs.

Question 66

15 address lines can identify 64,000 memory locations.

Question 67

EPROM is easily programmed without special programming hardware.

Question 68

A powerful laser is required to write data onto a compact disc.

Question 69

To access a memory location for a read or write operation, the address code for that particular location is applied to the _______inputs.

Question 70

The______nput controls which memory operation is to take place - read or write.

Question 71

The memory______input is a means for completely disabling all or part of a memory so that it will not respond to other inputs.

Question 72

When the OE pin of a memory device is deactivated, the buffers are in a______ state.

Question 73

Modern hard drives store data by______of the medium.

Question 74

The process of entering data in a ROM is called programming or ______the ROM.

Question 75

In order to read a data word from ROM, we need to do two things: apply the appropriate______ inputs, and then activate the ______ inputs.

Question 76

On an optical disc, data is stored by changing______ of the disc surface.

Question 77

The primary use for NAND flash is______ .

Question 78

The applied______code determines which register in the array will be enabled to place its data word onto the bus.

Question 79

There will be a ______delay between the application of the ROM's inputs and the appearance of the data outputs during a read operation.

Question 80

Blu- Ray discs are capable of storing______ of data per side.