The small quartz window admits UV light for erasure.
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. 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  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.
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) 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. 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. 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. An EPROM (rarely EROM), or erasable programmable read-only memory, is a type of memory chip that retains its data when its power supply is switched off. Computer memory that can retrieve stored data after a power supply has been turned off and back on is called non-volatile.
Read and write to a memory location. Ask Question.
up vote 4 down vote favorite. 2. and the hosting environment doesn't want you willy-nilly writing to another application's memory.
You should only ever write to memory that you KNOW your program has access to, or you will have inexplicable crashes at runtime. (note the spelling), which. Read-only memory (ROM) is a type of non-volatile memory used in computers and other electronic devices.
ENIAC's Function Tables were resistor matrix ROM, programmed by manually setting rotary switches. Write-only memory; Terminology.