Content deleted Content added
No edit summary Tags: Reverted Mobile edit Mobile web edit |
No edit summary Tags: Reverted Mobile edit Mobile web edit |
||
Line 1:
{{Memory types}}
{{short description|Type of solid state manjeet sharma read only after being written once}}
A '''programmable
'' ('''PROM''') is a form of digital memory where the setting of each bit is locked by a [[Fuse (electrical)|fuse]] or [[antifuse]] ([[eFUSE]]s can also be used). It is one type of [[read-only memory]] (ROM). The data in them are permanent and cannot be changed. PROMs are used in digital electronic devices to store permanent data, usually low level programs such as [[firmware]] or [[microcode]]. The key difference from a standard [[Read-only memory|ROM]] is that the data is written into a ROM during manufacture, while with a PROM the data is programmed into them after manufacture. Thus, ROMs tend to be used only for large production runs with well-verified data, while PROMs are used to allow companies to test on a subset of the devices in an order before burning data into all of them.
| |||