Digital Circuits : Practice Questions and Answers

A major disadvantage of the mask ROM is that it cannot be reprogrammed if stored data needs to be changed. PROM stands for Programmable Read Only Memory in which the ROM can be externally programmed by the user. EPROM stands for Erasable Programmable Read Only Memory, where the ROM and be cleared and re-programmed.

The computer’s main memory is RAM and ROM because all the storage related operation are performed by the data present in RAM/ROM. RAM stands for Random Access Memory where any address can accessed in any order. ROM stands for Read Only Memory wherefrom data can only be read.

All types of ROM are programmable and can be programmed as per requirement but the mask ROM is always programmed for specific application and it can’t be reprogrammed. PROM stands for Programmable Read Only Memory in which the ROM can be externally programmed by the user. EPROM stands for Erasable Programmable Read Only Memory, where the ROM and be cleared and re-programmed.

“Random access” mean which can be accessed randomly and in other words any address can be accessed in any order.

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In EPROM (Erasable Programmable ROMs), the ROM is cleared by exposing it to UV radiation and also it’s a tedious process. Whereas, in EEPROM, the ROM can be cleared electrically and thus is less time consuming and more efficient.

A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. So, it is not a part of hard disk.

DRAMs must be periodically refreshed so that it can store the new information. DRAMs are slower compared to SRAMs as the access time for SRAM is less than that of DRAM.

The input and output are used to control the function of a microprocessor. Hence, the control bus is used to transfer the input and output signal from microprocessor to external peripherals and or from external peripherals to microprocessor.

Expanded memory is not directly addressable by the CPU. Expanded memory is the additional memory which is incorporated beyond the parent memory limit of the processor.

In generalised form, the data paths are of 8 bits. The data path, also known as data bus, is the channel through which the processor sends and receives data.

EPROM (Erasable Programmable ROMs), the ROM is cleared by exposing it to UV radiation and also it’s a tedious process. Whereas, in EEPROM, the ROM can be cleared electrically and thus is less time consuming and more efficient.

The full form of EEPROM is Electrically Erasable Programmable ROMs. In EPROM (Erasable Programmable ROMs), the ROM is cleared by exposing it to UV radiation and also it’s a tedious process. Whereas, in EEPROM, the ROM can be cleared electrically and thus is less time consuming and more efficient.

MOS ROM is made up of MOSFETs. MOSFETs are Metal Oxide Semiconductor Field Effect Transistors.

The MOS technology based semiconductor ROMs are classified into three categories: Mask ROM, PROM,& EPROM. PROM stands for Programmable Read Only Memory in which the ROM can be externally programmed by the user. EPROM stands for Erasable Programmable Read Only Memory, where the ROM and be cleared and re-programmed.

A sense amplifier for each column is necessary to convert from the low voltage and low energy to a sufficient level on the I/O data line.

A Dynamic RAM usually employs a technique called address multiplexing to reduce the number of address lines and thus the number of input/output pins on the IC package. Address multiplexing has 214 = 16384 bits.

A Dynamic RAM usually employs a technique called address multiplexing to reduce the number of address lines and thus the number of input/output pins on the IC package.

RAM is volatile. Therefore, it stores data only as long as the d.c power is on.

In a computer, cache memory acts between CPU and RAM.