Programmable read-only Memory
Programmable Read-Only Memory (PROM) is a type of read-only memory that provides users with the ability to select and input the desired data or program onto the memory chip. Initially, the memory chip is supplied in a blank state, and the user, typically a programmer, transfers the chosen data onto it. Once this data has been programmed onto the chip, it becomes permanent and cannot be altered or erased. To grasp the distinction between programmable and standard read-only memory, it is essential to first understand the concept of read-only memory.
The key distinction between programmable read-only memory and regular ROM lies in the fact that programmable memory is produced as a blank chip, with the user responsible for adding the data or program later. Once this data is added, the memory functions similarly to normal ROM.
What is the use of PROM?
Numerous electronics manufacturers incorporate programmable read-only memory into their products. It is commonly used in video game consoles, devices utilizing High-Definition Multimedia Interface (HDMI), mobile phones, and specific automotive components.
The functionality of electronic memory involves communication with the device it serves, such as a computer, through signals represented by zeros and ones. When the PROM memory chip arrives at the manufacturer, all its bits are initially set as ones. A programmer then manipulates the required bits, setting them to zeros, and the chip becomes ready for use.
Types of PROM
Various types of PROM chips exist beyond the basic form. For instance, Erasable programmable-only memory (EPROM) employs UV light for the erasing and rewriting of data. One-Time Programmable Non-Volatile Memory (OTP NVM) and Field Programmable Read-Only Memory (FPROM) share similarities with regular PROM, performing equivalent functions.