Write a short note on read only memory function

History[ edit ] Many game consoles use interchangeable ROM cartridges, allowing for one system to play multiple games.

Write a short note on read only memory function

Read-Only Memory (ROM)

The term burn, referring to the process of programming a PROM, is also in the original patent, as one of the original implementations was to literally burn the internal whiskers of diodes with a current overload to produce a circuit discontinuity.

OTP one time programmable memory is a special type of non-volatile memory NVM that permits data to be written to memory only once. Once the memory has been programmed, it retains its value upon loss of power i.

write a short note on read only memory function

OTP memory is used in applications where reliable and repeatable reading of data is required. Examples include boot code, encryption keys and configuration parameters for analog, sensor or display circuitry.

Commercially available semiconductor antifuse-based OTP memory arrays have been around at least sincewith initial antifuse bit cells dependent on blowing a capacitor between crossing conductive lines.

Texas Instruments developed a MOS gate oxide breakdown antifuse in The first process node antifuse can be implemented in standard CMOS is 0. Since the gate oxide breakdown is less than the junction breakdown, special diffusion steps were not required to create the antifuse programming element.

Ina split channel antifuse device [5] was introduced by Sidense. This split channel bit cell combines the thick IO and thin gate oxide devices into one transistor 1T with a common polysilicon gate.

Burning a fuse bit during programming causes the bit to read as "0". The memory can be programmed just once after manufacturing by "blowing" the fuses, which is an irreversible process.

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The positive voltage on the transistor's gate forms an inversion channel in the substrate below the gate, causing a tunneling current to flow through the oxide. The current produces additional traps in the oxide, increasing the current through the oxide and ultimately melting the oxide and forming a conductive channel from gate to substrate.

Embedded System Design with C Archived from the original on 27 April Archived from the original PDF on Archived copy as title link.Read-Only Memory (ROM) One major type of memory that is used in PCs is called read-only memory, or ROM for short.

ROM is a type of memory that normally can only be read, as opposed to RAM which can be both read and written. Read-only memory (ROM) is a type of non-volatile memory used in computers and other electronic devices.

Data stored in ROM can only be modified slowly, with difficulty, or not at all, so it is mainly used to store firmware (software that is closely tied to specific hardware, and unlikely to need frequent updates) or application software in plug-in cartridges.

write a short note on read only memory function

A USB flash drive, also known as a thumb drive, pen drive, the speed in which the USB controller device can read and write data onto the flash memory, and the speed of the hardware bus, especially in the case of add-on USB ports.

Some preloaded drives are read-only, while others are configured with both read-only and user-writable. On most modern computers, the read-only memory is located on a BIOS chip, shown on the left. The BIOS chip is normally plugged into the motherboard.

The read() function shall then return the number of bytes read, and place the zero-byte message back on the STREAM to be retrieved by the next read(), getmsg, or getpmsg. In message-nondiscard mode or message-discard mode, a zero-byte message shall return 0 . Short for Read-Only Memory, ROM is a storage medium that is used with computers and other electronic devices. As the name indicates, data stored in ROM may only be read. It is either modified with extreme difficulty or not at all. Note: Other expansion cards and devices may have their own EEPROM or ROM on them as well. Related pages. On most modern computers, the read-only memory is located on a BIOS chip, shown on the left. The BIOS chip is normally plugged into the motherboard. You have probably heard of the term CD-ROM.

You have probably heard of the term CD-ROM. ROM- (Read-only memory) Read-only memory (ROM) is a class of storage medium used in computers and other electronic devices.

Short for programmable read-only memory, a memory chip on which data can be written only once. Once a program has been written onto a PROM, it remains there forever. Unlike RAM, PROMs retain their contents when the computer is turned off. A USB flash drive, also known as a thumb drive, pen drive, the speed in which the USB controller device can read and write data onto the flash memory, and the speed of the hardware bus, especially in the case of add-on USB ports. Some preloaded drives are read-only, while others are configured with both read-only and user-writable. ROM is "built-in" computer memory containing data that normally can only be read, not written to. ROM contains the programming that allows your computer to be "booted up" or regenerated each time you turn it on. Unlike a computer's random access memory (RAM), the data in ROM is not lost when the.

Data stored in ROM cannot be modified, or can be modified only slowly or with difficulty, so it is mainly used to distribute firmware (software that is very closely tied to specific hardware, and unlikely to need. Short for Read-Only Memory, ROM is a storage medium that is used with computers and other electronic devices.

As the name indicates, data stored in ROM may only be read.

Related pages These IBM tabulating machines from the s used mechanical counters to store information A portion of a core memory with a modern flash SD card on top 1 Megabit chip — one of the last models developed by VEB Carl Zeiss Jena in Early computers used relaysmechanical counters [3] or delay lines for main memory functions.

It is either modified with extreme difficulty or not at all. Note: Other expansion cards and devices may have their own EEPROM or ROM on them as well.

Related pages.

Write a short note on computer memory