The core of the electronic enthusiast network : This article introduces the principle of the burning process of programmable read-only memory (PROM).
The Programmable Read Only Memory (PROM) chip is blank at the new time, but is preset to binary one. The 1Mbit ROM chip used in the computer has 1 million (actually 1048576 bits) bits, each of which holds 1 binary 1. The blank PROM is programmable, ie it is written to it. There is a need for a dedicated machine called a programmer, a ROM programmer, or a ROM burner for writing.
We refer to the programming process of ROM as "burning", which is an appropriate technical description of this process. Each binary "1" can be seen as a complete lossless fuse. Most chips operate at +5V. When programming the PROM, a higher voltage is applied to each address of the chip. Usually +12V, the fuse is blown at the corresponding position of the higher voltage, and any given 1 is changed to 0. Although 1 can be changed to 0. However, it must be clearly recognized that the process is irreversible, that is, It is no longer possible to change 0 to 1. For this reason, PROM chips are often referred to as one-time programmable (OTP) chips, and they can only be programmed once and cannot be erased. Most PROMs are very cheap, and if you need to change the program in the PROM, you can discard it with a new chip.
The time required to program the PROM varies from a few seconds to a few minutes, depending on the size of the chip and how the programming device is used.
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