Before any instruction is processed by the CPU, it is stored in the register, then the CPU takes those instructions from the register and processes them accordingly.ĭata is stored from 32 bits to 64 bits in the register memory. It is used in low-level programs such as firmware or microcode.ģ.It holds instructions of the program currently running by the CPU. The data stored in it are permanently stored and can not be changed or erasable. In this type of ROM, each bit is locked by a fuse or anti-fuse. PROM (Programmable read-only memory): PROM is a form of digital memory. This type of ROM data is physically encoded in the circuit and only be programmed during fabrication. MROM was the very first ROM that consists of a grid of word lines and bit lines joined together transistor switches. MROM (Masked read-only memory): We know that ROM is as old as semiconductor technology. Now we will discuss the types of ROM one by one:ġ.
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