Information about Mask Rom
Mask ROM (MROM) refers to a kind of ROM (read-only memory) whose contents are programmed by the Integrated Circuit manufacturer (rather than by the user). The terminology "mask" comes from Integrated Circuit fabrication, where regions of the chip are masked off before during the process of lithography.
It is common practice to use rewritable UV-EPROM or EEPROM for the development phase of a project, and to switch to mask ROM when the code has been finalized. For example, Atmel microcontrollers come in both EEPROM and Mask ROM formats.
The main advantage of mask ROM is its cost, since it is significantly cheaper than other kinds of ROM. It is also very compact. However, on the flip side, the one-time masking cost is high and there is a long turn-around time from design to product phase. Design errors are costly: if an error in the data or code is found, the mask ROM is useless and must be replaced in order to change the code or data.
Read-only memory (usually known by its acronym, ROM) is a class of storage media used in computers and other electronic devices.
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It is common practice to use rewritable UV-EPROM or EEPROM for the development phase of a project, and to switch to mask ROM when the code has been finalized. For example, Atmel microcontrollers come in both EEPROM and Mask ROM formats.
The main advantage of mask ROM is its cost, since it is significantly cheaper than other kinds of ROM. It is also very compact. However, on the flip side, the one-time masking cost is high and there is a long turn-around time from design to product phase. Design errors are costly: if an error in the data or code is found, the mask ROM is useless and must be replaced in order to change the code or data.
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- The notion of read-only data can also refer to file system permissions.
Read-only memory (usually known by its acronym, ROM) is a class of storage media used in computers and other electronic devices.
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integrated circuit (also known as IC, microcircuit, microchip, silicon chip, or chip) is a miniaturized electronic circuit (consisting mainly of semiconductor devices, as well as passive components) that has been manufactured in the surface of a
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EPROM, or erasable programmable read-only memory, is a type of computer memory chip that retains its data when its power supply is switched off. In other words, it is non-volatile.
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