This set of VLSI Multiple Choice Questions & Answers (MCQs) focuses on “Flash memory “.
1. Flash memory is a non-volatile storage device in which data
a) can be erased physically
b) can be erased magnetically
c) can be erased electrically
d) cannot be erased
View Answer
Explanation: Flash memory is an electronic, solid state, non-volatile memory storage device which can be electrically erased and reprogrammed.
2. NOR type flash allows ______ to be read or written independently.
a) one machine cycle
b) one machine word
c) one machine sentence
d) one bit
View Answer
Explanation: NOR type flash allows a single machine word that is one byte to be written to an erased location or read independently.
3. NAND type flash memories are used in
a) Memory cards
b) USB
c) Solid state drivers
d) All of the mentioned
View Answer
Explanation: NAND type flash memories operates primarily in memory cards, USB flash drives and solid state drivers.
4. Which is a comparatively slower device?
a) ROM
b) RAM
c) flash memory
d) SRAM
View Answer
Explanation: Flash memory has fast read access time, but static RAM or ROM are comparatively faster than flash memory.
5. Floating gate transistor in flash memory has
a) two gates
b) one gate
c) two sources
d) two drains
View Answer
Explanation: Floating gate transistor in flash memory has two gates. These two gates are – floating gate and control gate.
6. In NOR type flash memory, each cell has one end connected to
a) source
b) drain
c) gate
d) ground
View Answer
Explanation: In NOR type flash memory, each cell has one end connected directly to ground and other end connected to the bit line.
7. In NOR type flash memory, data is erased
a) bitwise
b) bytewise
c) blockwise
d) sentence wise
View Answer
Explanation: In NOR type flash memory the data can be erased only blockwise basis. all the cells in an erase segment must be erased together.
8. The transistors in NAND type flash are connected in
a) series
b) parallel
c) cascade
d) randomly
View Answer
Explanation: The NAND type flash memory also uses floating gate transistors and it is connected to form NAND gate. The transistors are connected in series.
9. In NAND type flash, memory can be addressed bit-wise.
a) true
b) false
View Answer
Explanation: In NAND type flash, memory can be addressed by word, page or even bit wise. In NOR type flash, memory can be addressed by page then a word.
10. The program erase cycle in flash memory is
a) finite
b) infinite
c) all of the mentioned
d) none of the mentioned
View Answer
Explanation: One disadvantage of flash memory is that it has finite number of program-erase cycles. This limits the usage of flash memory.
11. NOR type flash needs error correcting code.
a) true
b) false
View Answer
Explanation: NOR flash memory is a storage device. It has slow write speed compared to NAND type flash. Typical NOR type flash does not need error correcting codes.
12. Which allows random access to read?
a) NOR type flash
b) NAND type flash
c) all of the mentioned
d) none of the mentioned
View Answer
Explanation: The interface provided for reading and writing is different. NOR type flash provides random access for reading whereas NAND type flash provides page access.
13. Which has high storage capacity?
a) NOR type flash
b) NAND type flash
c) all of the mentioned
d) none of the mentioned
View Answer
Explanation: NAND type flash memory has different connections and interface when compared to NOR type flash. Storage capacity is more in NAND type flash than NOR type flash memory.
Sanfoundry Global Education & Learning Series – VLSI.
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