𝗖𝗵𝗮𝗽𝘁𝗲𝗿 𝟭𝟬: Memory Interface

Question 1

What are the four common types of memory

Answer 1

ROM, EEPROM, SRAM, DRAM

Question 2

The least significant address input

Answer 2

A0

Question 3

are the points at which data are entered for storage or extracted for reading.

Answer 3

Data Connections

Question 4

An 8-bit-wide memory device is often called a ________ memory

Answer 4

byte-wide

Question 5

o Select a memory location within the memory device

Answer 5

• Address inputs

Question 6

o Have a set of data outputs or inputs/outputs

Answer 6

• Memory devices

Question 7

o Selects or enables the memory device

Answer 7

• Chip select (CS)

Question 8

o Also called Chip enable (CE)

Answer 8

• Chip select (CS)

Question 9

o Also called Select (S)

Answer 9

• Chip select (CS)

Question 10

o Gate

Answer 10

• Output enable (OE)

Question 11

o Control input often found on a ROM

Answer 11

• Output enable (OE)

Question 12

o must be active to perform a memory write

Answer 12

• Write enable (WE)

Question 13

o permanently stores programs and data that are resident to the system and must not change when power supply is disconnected

Answer 13

• read-only memory (ROM)

Question 14

o often called nonvolatile memory

Answer 14

• read-only memory (ROM)

Question 15

o more commonly used when software must be changed often or when too few are in demand to make the ROM economical

Answer 15

• erasable programmable read-only memory (EPROM)

Question 16

o programmed in the field by burning open tiny NI-chrome or silicon oxide fuses

Answer 16

• programmable read-only memory (PROM)

Question 17

also called Flash memory

Answer 17

• electrically erasable programmable ROM (EEPROM)

Question 18

also called EAROM (electrically alterable ROM)

Answer 18

• electrically erasable programmable ROM (EEPROM)

Question 19

also called NOVRAM (nonvolatile RAM)

Answer 19

• electrically erasable programmable ROM (EEPROM)

Question 20

o Newer type of read-mostly memory (RMM)

Answer 20

• electrically erasable programmable ROM (EEPROM)

Question 21

o retain data for as long as DC power is applied

Answer 21

• Static RAM memory devices

Question 22

o no special action (except power) is required to retain stored data

Answer 22

• static memory

Question 23

• essentially the same as SRAM, except that it retains data for only 2 or 4 ms on an integrated capacitor

Answer 23

Dynamic RAM (DRAM) Memory

Question 24

• Two special pins

Answer 24

o Column address strobe (CAS)
o Row address strobe (RAS)

Question 25

o Latest DRAM

Answer 25

* DDR (double-data rate) memory device

Question 26

* PLD

Answer 26

o Programmable logic device

Question 27

* Three SPLD (simple PLD)

Answer 27

PLA PAL GAL

Question 28

o PLA

Answer 28

 Programmable logic array

Question 29

o PAL

Answer 29

 Programmable array logic

Question 30

o GAL

Answer 30

 Gated array logic

Question 31

* CPLD

Answer 31

o Complex programmable logic devices

Question 32

* FPGA

Answer 32

o Field programmable gate arrays

Question 33

* FPIC

Answer 33

o Field programmable interconnect

Question 34

* ASIC

Answer 34

o Application-specific integrated circuit

Question 35

o internally structured as a programmable array of combinational logic circuits

Answer 35

* Combinatorial Programmable Logic Arrays

Question 36

* HDL

Answer 36

o Hardware description language

Question 37

* VDHL

Answer 37

o Verilog HDL

Question 38

o often called to location FFFF0H

Answer 38

* Cold-start location

Question 39

* SECDED

Answer 39

o Single error correction/double error correction

Question 40

o the 16-bit data bus must be divided into two separate sections called the

Answer 40

* Banks

Question 41

o holds all the even numbered memory locations

Answer 41

* low bank

Question 42

o holds all the odd-numbered memory locations

Answer 42

* high bank

Question 43

o Contain a 64-bit data bus which requires either eight decoders or eight separate write signals.

Answer 43

* Pentium through Core2 microprocessors

Question 44

o requires address multiplexing and refreshing

Answer 44

* Dynamic RAM

Question 45

o Extended data output

Answer 45

* EDO

Question 46

o stores the 256 bits selected by RAS into latches

Answer 46

* EDO

Question 47

o used with most newer systems in one form or another because of its speed

Answer 47

* SDRAM

Question 48

* SDRAM

Answer 48

o Synchronous Dynamic RAM

Question 49

o Double data rate memory

Answer 49

* DDR

Question 50

o latest improvement in a long string of modifications to DRAM

Answer 50

DDR